Thanks for the replies!
Originally Posted by ic-racer
The first camera is based on the Takumar 6X7 90 mm leaf shutter.
I am presently thinking and doing sketches etc for the second camera which will take the non shuttered Tak lenses.
The retro focal ones ( 75mm and 55mm) have larger diameter rear elements.
Last week I was lucky to find and purchase a Copal 495 which is a bare shutter with solenoid and an open diameter of 45 mm, for internal mounting.
I am setting up a lens bench to hold the shutter and lenses, to measure the shutter speed etc. I am thinking to add electronic circuit board to time the shutter and maybe an extra solenoid to close it faster