Been There, Done That Dept.

When I was young, I had the misshapen idea I was "saving"
money by building everything myself. That's because I didn't
figure my time into the equation. Time is free, and I'm immortal,
and yada yada. Here's an article I would have written then, about
using $10k of time to build a poor-quality lens adaptor that makes a
Canon XL2 digital camera perform like a 35mm film camera already
does, to "save" $8k a pro would charge to build it for me. Got that?
Simple math - buy a 35mm film camera and film for $5k, and shoot
a film that will project on a big screen, in any theatre in the world.
Or, if you really insist on having to do it the hard way.