Ok, so I want to build a 4x5 pinhole camera. I ordered two matching 4x5 backs from the classifieds here. I will build a box around that. However, for a shutter I was thinking about stripping down a Pentax K1000, adding a Skink Pinhole Pancake with a pinhole plate around .400mm. I was going to make bellows and a gg back (which I figure a 50mm lens around f/22 should help me compose before adding on the pinhole pancake.) Add on the 4x5 back and use the shutter from the k1000 for my shutter. I will remove the back half of the camera and attach it as possible to a lensboard so I can still access the shutter and shutter speed. What will/will not work with this?