The M03 is FWD and will not drift. I already tried it
The Mini Cooper body will not fit the TT01, it's too short. You might be able to fit the Porsche body on the M03L by converting it to a FF02, or you could just buy a FF02 and get a Porsche shell for it. The FF02 is basically an M03 with a longer wheelbase extension and longer arms. The only problem is that the steering servo is on top, so you might not be able to fit low-nose bodies properly. M03 and FF02 should pretty much be equal when bombing around the parking lot, although the FF02 will be more stable due to the longer wheelbase and wider track. And yes the HPI Miata body will fit the M03L, but you will have to configure it to Medium wheelbase by using the shorter chassis extension which is included in the kit.
Another option is to get two M05s. You can fit the Mini Cooper S body on one, and install a 3Racing 257mm wheelbase extension kit on the other, so you can mount standard touring car bodies like the Porsche. However you will still need to install longer arms otherwise it'll look weird
