I used the cart I had designed for my MU-2. Just had to modify it a bit for the dust collection. I'm probably going to replace the top of the cart with a larger piece of plywood (all Baltic Birch) and may add a drawer for the peripherals for the Hoffmann. The dust collection is a DeWalt shopvac that rolls along with the cart, if needed.
The cart surface is 37"high putting the bed of the Hoffmann at 44.5". It's a good height, and I have good leverage with the handle (manual model). If you are designing from scratch, find what height is most comfortable for the primary user and build accordingly. With the pneumatic operation the mechanical advantage isn't important. Mine is also on casters (2 locking) because it has my thickness plane on the lower shelf, and has to be moved to the center of the room to effectively use that. If I'm using the Hoffmann, it's in something of a corner (nestled between the Brevetti infeed and the Phaedra outfeed fences).
If I had the space, I would build a pair of wing tables for the frame rails, left for before routing, and right after completing.