Step 1: Not so much a step as basically, well nearly everything..
then i drew around and cut out the shape from 3/4 mdf, cutting out the inside first to make it hollow,also making sure the inside hole was big enough to clear the circuit boards for the speakers,(the mdf is around 6mm thick after cutting out) then a back plate the same as the front was screwed to form the finished box.. this was covered in iron on solartex, and painted..
Step 2: Wiring it up
plug your mp3 in an leave in your pocket! ive tried many different ways of holding an mp3player, with no success... and it gets expensive! ive killed loads..
its easier to replace a wire(if u do a header) then an mp3player ..
the battery pack was tie strapped on behind the seat..
again... sorry about the lack of photos, i will sort some out for mk4, im thinking of building lights into it...