Step 1: Materials and Tools
1 USB micro jack
2 Potentiometers, not logarithmic, mine are logarithmic and there is a narrow range of control now
2 Mono Audio Amp Breakout Boards
1 3.5 mm jack
8 bolts and nuts of appropriate sizes
Tools(This is what I used, you could probably get away with less)
Helping hands are practically a necessity, but if you are dextrus enough you might slide by without them
Chisel and hammer, Theses come in really handy when I find out my laser cut design wast good enough, which is often.
Step 2: Design.
Anyway, I designed how I wanted the box to be using sketchup and then transferred the faces to an SVG file and put them on the Ponoko P2 laser cutting template.