Looking good so far, reminds me of my first attempt at building a Beetleweight. That was held together with tape as well! :P

Got a few bits on order but was wondering if it’s better to have the weapon on a separate circuit or to have it all powered by one battery?
As alluded to, provided you have sufficient capacity, you can run it off of one battery unit but it is worth considering, in my opinion anyway, how resilient that will be. Kaizen used to use separate circuits for its weapon and drive but that was largely down to it having the weight to run it. Jibril doesn't and so uses a common circuit.