>>3376155cakekelly here, this isn't me, and the poster I am replying to is super new, first of all, I'm Currently building the software stack for some basic digital cameras I'm hoping to build. The eventual goal is to be able to make a digital back from either scavenged old CCDs or modern (expensive) Sony CMOS.
I'm planning a 4x5 build and currently looking for a material to make the bellows from.