Well, the walking robot was a bust. Those cardboard pulleys and rubber band belts just couldn't overcome the friction of the leg pieces and the cranks...maybe my dc motor was too weak. I don't know, it was just a mess.
I finally got around to giving the motorized tankbot a shot. I decided to make it a quadruped instead of a hexapod to cut down on complexity, cost, and trying to use the electronics I have on hand. Over the last few weeks, just a bit at a time, I have slowly cobbled together a quadruped frame from craft wood sticks I purchased from Walmart. I went through a couple of prototypes before settling on a simple design. I did the design work with Inkscape, then exported g code and plotted the templates for the leg pieces on my plotter.
I made them simple for easier wood cutting, but I will add detail with cardboard and paper. at least that's the plan.
Here's a video of one of the prototypes:
And here are some construction pictures in no particular order: