I may have to ask Rich but I could not fit a PIN in anywhere. I decided to tighten down the clamps as best as possible, add a lot of heavy duty tape for support and it seems to work. I have some pics but need to upload. I could not figure out a good way to use a pin at the bottom. just no room. I have had it up for a week and a lot of driving. Still all good.
As far as you power problems, I have gone through a bunch of problems myself. More so the heat in AZ. I have had to pull my setup from the trunk to the inside of the cabin. the E46 has AC vents under the front seats and I am hoping to squeeze it under the driver side. I initially was going to do this with a t23 IBM laptop and docking station. The laptop just would not fit well under those seats. It is real tight under there. I noticed we both are looking for a good BMW frodo skin. I am no skinner so let me know if you find a good one. Just not enough time in the day to work on a skin.