Yeah, if you are a DIY type camera builder then definitely have the lens off that thing and try it, stopped way down, f45 or f64, on 4x5. Last winter I produced a series of 4x4 (Yes, 94x94mm format.) for 4x5 film holders. Made 16 of them all to the same dimensions out of hobby plywood. That way I can try all manner of oddball found lenses using photo paper as a negative.
Why did I make them 4x4? A little less diameter image circle needed, about 133mm. And no need to decide between vertical or horizontal composition. And still a big negative.
Photo paper as a negative is cheap, can be handled under safelight, and is slow enough that you don’t need a fractional timed shutter.
Edit; Moved closer to the bin! Oh Pete, that just makes the heart of inveterate camera hackers like Francois and myself ache.
But, camera building/hacking is not for everyone so no recrimination from me.