I would like to use servos and steppers to design and build some moving toys, controlled by arduinos. Such as a crane, or a pan-tilt platform, or a car. The main goal, a part of enjoying myself, would be to interest my sons in technology. They don't seem to be very impressed about flashing leds or display. Perhaps moving things..
What would you use to do so ? I have seen Meccano and also Lego mindstorms, but the Lego seems to come with its own electronics and its expensive. It must be something reasonably priced, allowing us to quickly play with the servos, steppers and some C code to male small toys and then disassemble them.
Any ideas will be welcomed !