[dtengineering]

As far as I can tell from the rules, you are not REQUIRED TO use Tetrix parts, they are merely one of the options available.

Although, to be fair, the batteries and motors are almost a requirement as I don't see any of the other materials being particularly useful for energy storage and conversion.

The mini bot (again, as far as I can tell) is NOT REQUIRED to use the RCX. I see nothing in the rules stating that MINIBOT motors have to be controlled through a speed controller. The minibot motors could (unless there is a rule to the contrary that I have missed) be running at the beginning of the match, and the hostbot would simply place the minibot on the pole and let it climb.

But I'm throwing a disclaimer in here... I haven't gone through every inch of the rules yet.... but consider why you would want to carry the extra mass of a Lego controller up the pole when you are trying to go quickly.

Jason