Part two
OK onto some "technical" aspects.
Other posters have suggested "covering" a platform with some form of fabric. Good idea in concept. Where will you find a black fabric large enough to do so? Especially "polyester fabric without chemical finishes?"
Same for the 3/16" - 1/4" acrylic (especially UV filtering) You will need a piece 72 x 96. Do you have a resource? Sometimes for large pieces of acrylic, we have to bring them in by truck or train. And, again do you have a means to cut it?
The "sourcing" of materials and the time spent in engineering (including consultation on the Grumble)
has a value and should be charged for.
My personal experience on things this large is that a framework of wood covered by screening material may not be structurally rigid enough - and if used, may also require the use of a heavier frame to support the significantly greater weight of the acrylic.
If I were to do this project, (again without regard to 100% archival framing) here is how we would handle it.
1. Construct a wood strainer with cross supports of 5/8 x 1-1/2" pine such as Universal MSB06. I would buy much more than needed to assure that it is all straight and warp free.
2. I would cover the platform with 3/16" natural gator that is contact cemented to the strainer at all points. I would probably use several pieces of the gator and join the seams over the cross supports. Contact cementing the gator to the cross supports will make a very rigid and lightweight platform. An alternative is to use coroplast, but your seams will never be as flat and unless you use two layers of coroplast with the flutes running at opposing directions, it will not be as rigid.
3. The visible area of the perimeter of the flag is what is important. I would rip 4-5" wide strips of gator, mitre them (taking into consideration the thickness of the fabric used to wrap them) and cover them as a mitred wrap to surround the platform. The flag will overlap the strips and all you will see is the fabric covered portion. This will also allow you a significantly greater amount of fabric to choose from. If the fabric (as blacks tend to do) has a weave that is open enough for you to see the tan color of the gator through it, I would gesso the strips with black gesso before covering them with fabric.
4. The area inside the strips needs to be built up to make a level surface. I would either use black gator glued with dots of PVA adhesive (or fabric adhesive) or black coroplast. Both materials would allow the flag to be sewn through. If you are concerned with what the flag is resting on, you could line the gator with marvelseal.
5. From your photo, it appears the fringe is twisted multi stranded cord. If so, you can easily shoot Attach-EZ fasteners inside the tassels (yes it is a lot of work) and they would hold fine. You could also color the fasteners using the pigment pens Pat sells to make them hide better. Where the wood platform crosses where attachment points are, you will have to drill small holes (I like a Dremel tool with a #50 bit (available from United). You can use nylon thread to make the attachment at those points. Same for areas of the flag where the wood crosses the attachment point. If this is not an alternative, count the tassels, figure out how long you think it would take to sew one, and then double it. Now you have a time factor x your shop rate for just sewing the fringe. I do not trust a compression fit on something this large. I
KNOW from experience that compression fits fail.
The area where the body of the flag meets the tassel looks like a good area to attach the flag, but you want to be sure that any stitches also hold some aspect of the striped material and not just the tassel border. In addition, you may also need to put some stitches in the body of the flag. The problem is that if you put batting behind the flag it will exacerbate the “pulls” of the sewn points and it may not be aesthetically pleasing unless done very evenly. Nonetheless, it is something that also needs to be confirmed with the client prior to commencement as it is hard to undo if they are not happy. You may also want them to see the sewn piece before it is put into the frame.
6. I already mentioned either enlarging the lip of the frame or cutting an expansion slot. Selection of a moulding that can support the weight of the acrylic is also important. If you choose a deep(er) moulding (since your platform will be at least ¾-1” thick, plus spacer thickness plus acrylic thickness) like Studio 23401, how will you join it? The majority of the weight will be at the lip. Even if you stack 2 5/8” v-nails, you may not get adequate support at the top of the joint. This is also a time to clamp and wait. An appropriate clamp for tall mouldings is a bonus. Here is the best one I know of but it costs almost $500 per clamp. So, if you own one, there is a value to having/owning one. And, if you don’t have one, this project could fund one.
http://www.mmdistributors.com/MASTER-CLAMP-III-Shad-Box-2-1-2-Wide-X-2-16-Inches-p/5107
Also, this might also be a great time for some slight/narrow head drywall finishing screws drilled into the miter at the top and bottom of the frame (where they are not seen from the side)
http://www.mcfeelys.com/product/072...uot-HeadCote-Stainless-Steel-Trim-Head-Screws
These screws use a square drive, so you will also need the appropriate bit. The head diameter is very small. Mcfeely’s is a great resource for lots of fasteners.
7.When fitting something this large and heavy, we always cover our fitting tables with sheet plastic (visqueen). Even a slight move of the frame while face down can burnish a finish and the plastic adds excellent protection (in addition to making working with a sheet of acrylic that large much easier.) Also, use a damp rag and thoroughly wipe down the masking of the acrylic before peeling. It will reduce static and make removal significantly easier.
8.Unless you rip black acrylic strips for setbacks, or are willing to settle for the finish of black gator (ugly in my opinion) – you either will have to seam two pieces of spacer (like Arlo Spacemaker) or rip gator strips and cover with fabric. If so, the setbacks (spacers) need to be at least ½” thick as wrapping something thinner is much more difficult. Also, this is no place for ATG as a method of attachment. You can use ATG to hold the spacers in place, but they should be glued in with dots of PVA glue.
9. Finally, I would use a method of fitting that provides a structural connection between the frame and platform. Kreg pocket screws are an excellent choice. If you go this route, drill all of the pockets before covering the platform and sewing the flag!
http://www.kregtool.com/Pocket-Hole-Jigs-Prodlist.html
I am sure I left out a lot, but it is a good start……