Nxt Variants

I decided to construct the Alpha Rex which is the original model, it took me about 2 and a half to 3 hours to build and is quite complex. However they are easy to follow instructions which means that with time younger people could construct it, it is a bit unclear about the wiring but it can be worked out. The Nxt is a very easy to use interface with simple push commands or there is a program on a computer for more complex sequences.