Lots of things are possible if you have access to a machine shop and can shape metal as you please, know enough electronics to get the controller not to resist back-driving, get it to turn the right direction etc. But I guarantee that as long as you value your time more than a couple dollars an hour, it will cost you more to roll your own Stokemonkey than to wait for mine, at least for a similar level of function. I don't mean to sound unhelpful, but my patent attorney says that if I assist with petty infringement of the design, it will weaken my case in the event of large-scale commercial infringement.