Alternative to fuel tank behind seat:Speakers

[Richard2112]

This is a kit I built for my 70 C-30. Starting out I assigned myself some criteria
1) It had to use pre-existing hardware and contours of the cab No drilling/cutting
2) It had to have some acoustical properties Sound insulation/attenuation.
3) Once built, it had to be easy to install
4) It had to be multipurpose such that if I wanted to mount tools, hunting gear, stereo or whatever, I could easily choose.
5) It would have to made so it could be upholstered.
6) No visible mounting hardware
7) It couldn't be allowed to interfere with the seat travel
8) It couldn't interfere with seat belts (in my case, lap belts)

I chose to mount a stereo system. Built speaker boxes, bought amps and wired the whole thing before install. There are just three bolts needed to hold it in and those are the pre-existing bolts which once held the gas tank.