My only concern with doors is that they will all have some degree of rust - even if they look clean on the outside between the skin and frame you get surface rust build up. If your frames are beyond economical salvation then it makes sense to start with better doors but knowing the right type is the hard part, with 260z's in Australia I believe there might have been 3 different frames in use.
So telling an American to look for 260z doors is tricky, given they only had the 260z for 1 year and the 280z after that. New door skins are cheap at $250, importing a door will be more expensive than that.
Roof turrets are getting very rare, hence the reason I'm considering bringing some in for sale. Also the good thing about a roof skin is you can easily see both sides so it's harder to hide bog in them etc..
Anyway I might try and source at least 1-3 roof turrets if it works out well I'll import more if I can get my hands on them. If 10 people say they need 1, then I'll definitely bring in a couple - since a couple of people will always bail at the last minute etc..But I'm sure a roof skin will always be in need.