Do you want to use it as a copy camera to make 11 x 14 negatives, or do you want to use it in the field? ;<)
It would make the beginings a great enlarger. I converted a process camera into a giant enlarger and was restricted by bellows length as well. I got around that by making nesting boxes which rested on the camera body when needed between the negative vacuum projection back I built and the original bellows. The camera bellows only streched to 60" and I could extend it with these to over 96".
For field use you could make a really simple ULF camera using the bellows.