Your location is listed as "Reality". I'm thinking you've drifted away from home. A '34 5w is a dream car to many people. A 3w of same vintage is cool also. Are you prepared to sacrifice a 5w (and most likely ruin it) to achieve a car that will never be a 3w. Sell it to someone who appreciates what it is.
I'd buy it but the shipping from reality to where I am would be gastronormous. I have seen things along those lines done with cars sedans turned to coupes etc. I would think that 3 window doors is where I would start then maybe look for a 3 window roof. But I don't do things the way that everyone else does. Another avenue would be to find a 3 window that is rotted completely away on the bottom. Tne use a combo of your doors and the 3 window doors plus patch panels to repair the doors and out the 3 window from the belt line up on the 5 window.
I may be wrong, but I think the 3W quarters are shorter? Donnie Smart has the parts and the skill to make a 3W out of thin air, haha!
Take a piece of cardboard and put over the back windows....now you have a 3w. Take the cardboard off....and now it's a 5w again. It's the best of both worlds.