I'm on the 311 forum and I can't see the links either. Imgur has been the easiest to use for hosting pictures, in my opinion, especially for mobile users.
I can tell you that there are a lot of purists on 311s.org, and some of the stuff you're talking about doing certainly isn't "pure." I would avoid vinyl letters on the hood. Maybe if it was a racecar it would look okay. Dean sells reproduction letters for the hood in chromed molded plastic for short money. Maybe that's the way to go? The asshole previous owner before me removed all mine and filled the holes with bondo before repainting the car, so I don't have any.
To answer your question about wheels, yes, it's the fitment that drastically limits our options. Roadsters came with very narrow rims to begin with. What also makes it worse is that we have to clear the rear leafs, and tuck the rear wheels into the back fenders. Front fitment isn't half as bad. A good size rim is a 15x7 in a +15 to +18. You can extrapolate other sizes from there. Tire selections in 15" are way better than in 14", so most people go up to that size. If you're going to start chopping your car up and glue on some shakotan flares, then obviously you can run whatever you want.
That site can be a huge help for anything mechanical though, and the teck wiki is constantly being updated with a lot of useful information. Classic roadsters are usually not "ratted" out at much as some of the other Datsun models. Maybe that's why you're getting a lot of pushback.