I like the idea very much. my 2 cents on dimensions are to keep it in the style/taste of the interior...not too big. I would probably put mine on the cross member between the seats.

Build number is a good idea, build date is good too...by the way, I may have not ready thoughly enough through the threads, but where exactly on the door panel does it tell you the "Build date"? I see numbers but can't decipher what the "date" is...any help for the painfully slow Sennaspirit?