that's also a good point about width and maximum size. i could imagine a project in which several panels (like 10 vertical 60" x 80"s) all seam up and they could be basically butted together in the machine. would the printer just keep printing across the butted edges? that would eliminate the time consuming trimming seam up the images.
Not so much. Basically, because you are curing the ink as it is printing it will "seal" the boards together. if you were able to keep them perfectly flat and trim as they come out of the machine it might work, but i would be worried that if you lifted a panel it would tear the ink, which would obviously be failure.
My flatbed history is as follows.
Vutek PV200
Gerber CAT
Nur Tempo
Gandi 3150 (x2)
Vutek GS2000
Vutek GS3200
The advantage of a true flatbed w/ pin registration is just that, perfect registration. Or, close enough to perfect based on the squareness of your substrate. The disadvantage is that you have to unload and reload a board before printing can begin.
The speed advantage of a belt style is a quite large gain, especially on the newer Vuteks. The other major advantage is that you can run roll goods fairly easily. Would I try and run a 100' banner on the Vutek flatbeds....not so much. But once you learn a few tricks they can perform quite well on both rigid substrates and roll stock.