Collimation was performed using an SLR with a tele of 300mm. Set this to infinity, your DIY camera lens likewise to infinity. Mount your ground glass with a few X marks centre and in each corner, on the side facing the lens (on plane with the film), and let light shine through the back. Open up the aperture to max, and sight the SLR through the DIY camera lens. If the DIY lens register is spot on you´ll not only see the markings perfectly focused, but even ink blotches, particles of dust on the ground glass. If not shim up the lens cone, or sand it down, depending on if the register needs to be lengthened or shortened.
|Ground glass collimation mark in focus|
Next I went over the internal joins in the lens cone with black acrylic putty and remounted the Graflok back with a smear of putty on the mating faces. And then modified the viewfinder mount. The handle required some thought, and was left for a later revision. I added some protection for the lens too. The camera needed a bit of weight towards the front, as with the roll film back mounted it was rear heavy and would tip over. The lens protector bars counterweight the back nicely.
Version 0.2 looked like this:
|Version 0.3 - new handle|
I rather think it is maturing into a rather good looking camera.