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Nice car! Just like the Saint
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I would take care of that body first, before doing anything. Why? Because it might add up to more than you expect. Unless you have unlimited amounts of cash to spend, you'll want to make sure the rust repair falls within your budget. The 1800s, especially the early ones, are notorious for having hidden rust. Too many areas to point out just one, but you found out about the obvious already-the floor-and that's the "easy" repair. The rockers would be the next thing I check. Anything external on a P1800 is usually the tip of the iceberg. They hide their rust well. Don't take this as meaning to discourage. I'm just trying to save you the labor of putting parts on a car that might benefit from a full rotisserie style restore. Or maybe it's one of the few, like my orange ES, that saw little oxidation. It needed very little rust repair. Good luck!
The door panels, handles, dash, carpets, pretty much everything, are available. Even once it's together it will be loud, but better. You've probably found out that IPD is a good source for parts. There are at least three other good ones out there. There's a guy out east, can't remember his name, but he sells exclusively 1800 stuff. He is an absolute wizard at these cars. I recommend finding him and buying his parts because you'll get exactly what you need and his prices are fair. I'll check around for his name.
I'll bet you're finding the Brickboard helpful, if not a bit abrupt
. Not quite like here.