Single Speed Wooden Bike Drivetrain, with Spring-Action Tensioner!

I watched a neat video from a favorite site of mine, where a guy made some wooden bike cogs/chain.  I thought I would give it a try, to see if I could figure it out too.  Created my own CAD design templates for gears and chain cogs a while back (used it on the Tum-Bling Machine), so it came in handy for this too.