I think it's too easy. I've run across many of both and unfortunately years ago never thought about. Most of the sedans were soooo rusty and probably scrapped unfortunately and the 4drs gave up the parts. Hardest physical part of this conversion is the time consuming spot weld drilling and that's not even hard just time consuming.

I'm doing a 63 Plymouth after mine for a buddy. He couldn't find a true 2dr sedan he could afford that was solid.