The lens is a Rodenstock Sironar f135mm/5.6, and the back is a Horseman 6x8cm roll film back, originally for a large format camera. I bought a 65mm focusing tubus, flange adapter and copal adapter and printed a ring with the correct focusing markings for this lens. The grip is a standard grip for camera cages. The viewfinder is originally from a different camera, and covers a bit more viewing angle than the lens. The interior of the body is painted with musou black.

Here are some test shots on Tri-X (badly digitized with my phone):

https://pxscdn.com/public/m/_v2/632520794410387667/6ac28a0f2-92b4f8/TnKru643mUad/Uof5JcPDXJuEtMyGzrDg4GaALCfUYvkSnq5gbpiR.jpg

https://pxscdn.com/public/m/_v2/632520794410387667/6ac28a0f2-92b4f8/gjqhahXdbWUO/K7xdHh82rBO6GULNOY4XuQpxUxxl0diRvlBW2Rz6.jpg

https://pxscdn.com/public/m/_v2/632520794410387667/6ac28a0f2-92b4f8/KPFsmU3TxqBP/6wXaqSpYpx890qtDCyX5AX9LisQRqarorvEQ1zJD.jpg