Having performed this myself, a couple of points.
1. You can close the hatch. It is possible to power from a jump battery under hood using the 12v and ground points designed for jump start.

2. For others using this thread as a diagnostic tool, before going down the starter path, try to jump an additional ground from the engine to the body. On my 535, the starter wasn't at fault- the ground was. May save someone some $$$.

Nice documented procedure. Well done.

__________________
Dave

'05 325xi
'10 E70 35d
'85 911 Carrera
'66 911 Work in progress
'91 Chevy C1500
'95 Jeep Cherokee
‘18 Jeep JLU