Yes the rotors may need center spacers.That bike will end up on the street, i hope..my buddy took it back to Alberta..Calary.... Hope its easy to register a homebuilt there.
When we first got that bike it had about a 12 over sprnger and a coffin tank on it..
I mentioned the 18 cuz most guys end up spending 150 for a rim, 80+ for spokes.. Gets pricey fast..