Ive been wondering about taking a old boombox and adding a sled to the case, wiring the left and right output to the existing board and using one of those cordless drill batteries (or use a laptop battery...) for power.

You could add a switch that when the battery is not in the boombox then you could use the AC cord...

Now that would be neat.
_________________________
_____________
Sean in NC
130gb MK2a w/ 32mb ram
80gb MK2a empeg spare