I'm curious, what's your test rig ?
Basically i have a full sinar P with a Linhof sliding back adapter which interfaces with my Eylike H1 fitting back (which is a good place to start !)
I have removed the sinar front standard and made a 'custom lense board' that accepts a nikon lense
(mounting from an old FM2)
this lenseboard is attached into the front of the rear standard of the Sinar
The lensboard is 'shimmed' (has a pile of washers) to get the correct lense to chip distance