A friend (retired engineer) says common 1/4 inch plywood should be structurally fine for this. His thought is to attach it on the back side of the dash using the two 1/2 inch holes, make the cutouts for the radio and speakers and put foam at the top to stop rattling, squeaking, etc and add some stability. Sheet metal is a good idea but handling (cutting speaker holes, other holes, etc) is going to be a challenge from my point. Another thing...I've been hoping two 3.3" diameter round speakers could be used. I don't have dimensions, though. Could somebody measure the speaker opening (height/width), please? Two small oval shaped speakers could be used but those are going to be more costly and not the same quality as the German speakers I prefer. Also if somebody could cut a piece of cardboard and set it in place on the back side. I need to see the angle and what difference it will make at the top. Thanks!
