Parts I purchased:
1) 60RPM Speed Reducer Rectangle Shape N20# Magnetic Mini Geared Motor 6V DC (Amazon, http://www.amazon.com/gp/product/B00AUCGJX0/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1).
2) Coaxial Power Jack (Radio Shack part number 274-1583).
3) 3.0 Vdc Power Supply (Radio Shack part number 273-315 with the "N" style plug 273-345, you get one free with the power supply).
Tools I used:
1) Rubber mallet.
2) Small vise.
3) Flat punch.
4) Modeling knife.
5) Small files.
7) Slip joint pliers.
8) Needle nose pliers.
Print all pieces as shown in "Assembly.skp" or "Assembly.stl".
Test fit and trim, file, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on the colors you chose and your printer settings, more or less trimming, filing and/or sanding will be required.
Assemble as shown in "Assembly.skp" or "Assembly.stl". Wire the motor such that it rotates "Gear Motor.stl" clockwise as viewed from the gear face (see video).
Feel free to comment if you have questions.
Hope you like it!