Mounted my speakers on the gas tank lip and just use the top of the tank to put things. The seats do a good job of containing the stuff.

If you really think you need a shelf you might try using the tank lip as a stabilizer--wood or ? on either side and then build your shelf from there. The problem is if you have much slant on your seats you won't have room to store much.


1956 Chevy 3100
261/700r4 (formerly 3 speed OD)
In the Stovebolt Gallery
More pix on Photobucket