As far as film is concerned: I would love to shoot 9x12, either film or glass, in this camera, and I do know that I can get 9x12 film fairly easily (from impex, as Ian suggests, or from monochrom.de). I like the idea that this is basically a halfway-house between a field camera and a pocket bellows folder; I anticipate some lovely photos once i get things working reliably.
The trouble is that I'm not in Europe -- this makes things like e-bay or antique photo dealers an iffy proposition. In the long term, I'd love to get hold of the original hardware, but in the meantime, I'm wanting to 'make a plan' as they say around here: take pictures and damn the torpedoes. I'll see what I can figure out.
As for the shutter/lens: The lens is a Vogitar f/6.3 135mm anastigmat, which seems pretty sharp, though of course it's difficult to tell for sure by just holding a 4x5 ground screen to the back of the camera...
From a cursory examination (i.e., holding the two cameras next to each other), it has struck me that the 105mm Novar -Anastigmat/Prontor-S assembly from my Nettar looks as though it might be the same sort of size as the Vogitar/Ibsar. I intuit that this would give me a mild wide-angle effect, which might actually be kind of cool, though I wonder if the Novar has sufficient coverage for 9x12 or 4x5.
On another theme, I see that the aperture blades seem to be made of paper, and on two of the leaves, the little brass rivets which move them have come out. Suggestions?
I guess an afternoon's tinkering is called for; I just wish I had more junkers as donor parts; the Nettar works perfectly, and I don't really want to pull it apart...