I don't think most sedans make good 4 dr. g***ers either. The exception are Anglias and Austins, because even as a 4 dr. they're such small cars they can pull it off. I built my Austin 4 dr. g***er, and people usually don't even notice it's a 4dr. until I open the back door to grab something. Then they are surprised, and tell me they didn't notice it had back doors?
It will look like a poser. If you have a falcon more door and want to do something traditional build a sleeper. You will have to make your drivetrain rock solid and it is going to want to be beefed up underneath (they are unibody) but you will end up with a really trad build and something to be proud of.