So ive always loiked the "OEM" look of the E30 interior dash area. So when it came to adding switchs for various gadgets it was hard on finding placment for switches as to not disturb the factory look. i have always pondered the thought of putting concealed switches in the ashtray. That said check out my project:
ps, my camera sucks so mind the pictures, its looks WAY nice in real life!

starting from the left: first button is a momuntary red pushbutton to flash my 55W backup lights, second switch turns on my concealed radar detector (custom built into the service reminder indicator lights on the dash, looks heklla bitchin.....more on that later), second button turns on a concealed trunking scanner (so i have ears on the local authorities.....and so i can listen to airplanes), third switch activates my two front mouted missile launchers (no joke), the two small red buttons on the right are momuntary buttons to launch either one of the two missiles (more on that later too). the three center sqaure buttons have a green "on" led light so i know when they are "on".

heres the look when its closed.

heres a picture of the back, i should have taken it after i finished the curcuitry....in the picture it is full of silicone glue for protection.
anyways just thought id share, it took me awhile to build so any comments welcome and sorry for the poor quality pics, writeups on the custom radar detector, and missile launchers (just for kicks) are coming soon!!!