In general a good guide, but I noticed a few things:
-Electric lifters are missing in the weapon designs. Stinger (from bb) or Panic Attack could be used as examples.
-There are brushless escs that can change directions. But if you want to use bl-motors for anything else than a spinner, you got to know what you are doing (=not for beginners).
-You should mention that banebots gearboxes are not metric, so you need imperial tools for them
-The REC gearbox would be another (metric) alternative
-hdpe is a very good material for armour. I´d pick it over polycarbonate any day.