Yeah, I've got broken tabs for the grill, mostly inboard and upper-- never broke them putting the camera in and out, but from back before I figured out how to best insert and remove the grill for other reason.
Here's a link off to a post (on a different forum) that shows the installation.
http://www.bimmerfest.com/forums/sho...59&postcount=8
I'm currently using the open back on the full (not skeleton) case with a mic muffler on the back. Kind of looks like a raccoon toupee. Here's a link to the site I purchased it from. I'm also using their drop in polarizing filter.
http://www.eyeofmineactioncameras.co...uct_p/micv.htm
Edit: I also try to raise the hood between sessions, as I've seen some issues from heatsoak back into the camera. It lets me pretend I'm one of the forced induction guys...