On the plus side, the only tool you need to the motor using the c-channel method is a 10mm socket and ratchet. I used this as an excuse to buy a comprehensive socket and ratchet set
This post claims that you can remove the motor without removing the c channel, through the trunk with shelf removed, but I don't see how it's humanly possible to locate and cut the zip tie and wiggle the motor out this way.
https://www.bimmerforums.com/forum/s...ving-roof-DONE