Good luck - am in the process of some OCD detailing myself - don't be discouraged with the disassembly - unless your car is a rusty UK import its all pretty straight forward
Bought a carbon fiber diffuser from the states & fitted it up this week.
Also fitted a black vinyl windshield banner, in prep for the upcoming rally.
Most of the decals have arrived now - it's going to be a fun few days getting it ready
Thanks all - install is really easy, only took 30mins. Just gotta be careful not to destroy the standard brackets. Note: replace the standard plastic brackets with good stainless nuts & bolts or you're gonna have a bad time when someone pinches it.
^ from BNT
http://bimmersport.co.nz/topic/41438-e30-ball-joint-boots/?fromsearch=1
And for the lip...garden hedging from Bunnings (drill holes and screws) attached to standard lip