Hey there,

        I did this very thing... however, I used the grey cloth covered
speaker boxes to house my speakers... very nice sound.... and I can move them
out from under the seat to face out the side door when I want music outside
(like when I'm underneath the Wobbly Bus working on something).  Amp is under
the passenger seat ...near the battery.

Scott De Santi
86 Vanagon 2WD (The Wobbly Bus)
Anchorage, Alaska