The problem with permanent mounting is that it tends to not look good later, when the adhesive fails and makes bubbles or wrinkles in the mounted image.
And in mounting something so large, there is an increased risk of immediate damage or destruction if anything goes wrong. Even if this photo may be easily replaced and has no enduring value, a replacement would certainly cost a lot more than the profit on the framing, so I suggest playing it safe.
I would be inclined to use pass-through hinges every 12" or so. If the art paper is coated on the back, secure the hinges using Lascaux 360 as a contact cement (dry only to tacky before bonding) instead of starch paste.
The mount board may be a sheet of acrylic, and its static charge may enhance the mount. Or, a 4-ply alpha cellulose board may be reinforced with fluted polypropylene (such as Coroplast) or aluminum laminate (such as DiBond or AlucoBond).
I would also use a window mat with a generous overlap of the sheet's edges, and a spacer to separate it from UV-filtering acrylic by at least 1/4".