Makes sense, I can't see them being that expensive

Going back to the ESC stuff, a FeatherTwo Dual is likely to be more reliable than a Sabretooth and possibly better value for money - I know Madusa uses one but with any dual ESC it would seem, there is a tradeoff in terms of how much amperage they can deliver to a motor. I would prefer going with a setup described above as it can handle more load but it is more complex to get set just so (I spent an hour tuning the trims on my transmitter to get it moving in a straight line).

Beyond that, things like wiring in a LED and removable link is relatively straightforwards.