Well I mounted the new M3 tiller last night, and after a few setbacks initially as I couldnt work out how to release the airbag following the DIY on here, I researched a bit more and found another thread which displayed where I was going wrong (I couldnt find any holes in the wheel hub)
These pics display it quite well:
v's in the DIY
I was sticking the screwdriver in behind the steering wheel trim, turns out there is two 'flap' type openings in the hub of the steering wheel.
Minus the airbag (those airbags are bloody really heavy!)
And the new tiller mounted:
On another note I think I'm going to go ahead and purchase a set of brand new bmw performance 313 rims:
What they shall look like mounted: