A Dynamic River model I designed years back... Although I designed and built the electronics for it, there was a much large team involved with the rest of the fabrication and assembly.
This link will take you to a personal page where you can see the family and learn a bit about me and what I do when I'm not 'playing with the toys...'
This section has a usefull list of books that really apply to the technology of designing and building personal robots. Yeah, it may be a bit overkill for some hobbiests, but then again knowing where to find the reference you need is 1/2 the battle.