What I did with my 66 bug for sound deadning back in 96 was rhino lineing. Its all I could think of doing back then. I had it done top to bottom cause the car was stripped for painting. As far as the front stage went I made fiberglass panels and built the kick panels out. I had a 3 way system with fosgate 6 1/2's, 4's, and tweets. I think there is a company that makes fiberglass panels for the old bugs I cant remember the name. You could look in any VW mag. and find out or you can e-mail the magazines. Bass wise I kept the back seat and had 4-8's back there in a sealed box so you can do 2-10's in a ported box back there. As far as electrical I think you can get a 100 amp alternator now mine was only 75. Just get a battery isolater and have 2 yellow top Optima's or what ever will fit in the 2 spots under the back seat. 1 under each side of the back seat. They will fit its what I did with mine except mine where red. I hope this helped you a little bit.
