Step 1: What you'll need
Tamiya Twin-Motor Gearbox kit, Item 70097. Includes the mounting bolts. Available from Sparkfun.com.
6x8 Lego Plate.
3749 Axel Pin
6536 Axel Joiner Perpendicular
Lego Electrical Connector Cable
Epoxy (I used JB Weld â€“ regular, not quick setting.)
Lacquer thinner to clean parts before gluing. (I usually do this to remove mold release, oils, etc. However: Caution: Do this outside! Lacquer thinner is *extremely* flammable.)
ABS, PVC, & CPVC pipe cement. (This was suggested on several web sites to glue the Legos. Caution: Do this outside! The pipe cement is *extremely* flammable!)