Without another camera as a reference point, they deceptively look like they could be about the size of an SL66 or an RZ67.
What
is the battery situation on these?
I'm not sure how the size compares to an SL66 or RB/RZ 67
Here are a few snaps that might help scale
Pair of Fuji compacts with my trusty Nikon F2
Fuji GX680 III and Hasselblad 500C/M
Fuji GX680 IIIS and Hasselblad 500C/M
Fuji GX680 IIIN Back, Hasselblad A12 Back and Fuji 645 Back
The battery types were the deciding factor on me buying Mark III models.
Mark I and Mark II models used proprietary rechargeables on the body (making them much heavier) and soldered in batteries in the backs, which are not straightforward to change. The web is full of conversion threads to add modern DSLR batteries for the bodies but looking at these there can be issues.
The Mark III cameras use 3 CR123 batteries in the Body and 3 CR2 batteries in the backs. I am still testing how long they last. There is an AA battery pack for all three versions of the camera but these are about £125 on eBay, plus shipping and VAT on import.
After a couple of weeks with these cameras, they are huge compared with what I usually shoot with, they are heavy, somewhat absurd but most importantly though an absolute joy to use! They certainly attract attention. While taking the image I posted in the FPOY February thread, three security guards descended upon me and had to be convinced I was using a camera and not a weapon of mass destruction, I'm not joking about this either!