Re: wood dash-bad idea?
I did the wood dash thing once. It looked good for about two years, but I had my top off about half that time.
What I used was mahogany veneer about 1/16" thick, I coated both sides with 3 coats polyuathane to protect the wood, then overlayed it onto the dash. The guages and mounting bolts held it in place. I didn't have any problems with grounding anything because I still had the original dash behind the wood.
I think that if you keep it out of the rain and sun as much as possible it will last a lot longer than mine did.
Use wood that will not rot or turn color with moisture like oak.
75 CJ-5, 304, 44 locked 33x12.5 BFG's Wheeling Alaska