Nice build. I'm in the process of building my own, looked at some youtube vids and got some good ideas.
The only thing I can think of is as you have mentioned - steady movment. I'm thinking of making a plactic chain and a electric motor, as you can find in Lego / Technics. Don't know if its duable yet, but low weight and smooth action should do the job in theory.
Last edited by oddis; 05-20-2013 at 02:40 PM.