Finally found time to massage the fenders to make room for the new tires. The plastic trim piece is cut, so only the side facing out remains and the fender is bent in:
I've also started to build 25mm bumpstop extensions and cut 15mm spring spacers.
The Cooper STT Pro's I've bought are 25mm larger in diameter than the same size BFG Muds I've used for testing, so I need to see what I'll do for the front...