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Hell, I understood the concept the first time I saw it and built it as soon as I realized that it may be possible in LEGO. The hard part was finding all the little peices. Middle schoolers (with proper support, encouragement, etc.) should be able to do that no problem.
The only problem is that the RCX only has three motor outs, so it wouldn't be able to do anything but drive around unless you were really clever and made some spring-loaded stuff.
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