your going to need centerbores enlarged - possible problem making the wheel weak depending ho how far - your axle nut/dust cap is rather large compared to new cars hub centers
spacers are likely to push the wheels further out in the guard, its quite a high offset so will sit in a long way
you will need narrow springs/coilovers to have room to fit it under the guard & not hit the spring
the other issue if you want to be really really fussy is technically your effectively narrowing your track, illegal in the eyes of dept of transport
hope that helps you get your head around whats involved, it can be as easy or as complex as you like depending on interest in it being legal/insured in future 🙂
also, rear discs will need engineers approval/brake tests done in any state as far as im aware 👍
Volkswagen Drivers Club of Queensland - member 🙂
STIDUB - yep its still a work in progress
Vwdcq club car racing/ and crashing while my bug isn't finished.
The above are personal views, no more, no less