Projects 1936 Lincoln Zephyr Sedan 4door to 2door Conversion.

Well, I wish you the best of luck.
It's just that I've built a shit load of hot rods over the years with a lot of major modification (Chop tops, tudor into a convert...a 4 dr into a sedan delivery) and each of those major mods added at least another year to the build. Just trying to prepare you for the pain LOL.
For example, it took about 6 months to build just the rear door, frame it up, build matching door jambs and get the hinges right on my 4 door to Sedan delivery conversion...and that' just ONE rectangular door with NO compound curves.
I can't imagine making the compound curve door frames and matching jambs on 2 mirror opposite doors on your project...let alone the hinges.