So just tried with the 600x300mm polycarb base panel, The ESC fits "nice 'n' snug" horizontally on the panel now and the centre gap is about 50mm bigger to the point where it looks too big. However, I think if I want a no-nonsense weapon, the gap looks to be about right now because there needs to be room for the weapon mounts and so on. In other words, Kaizen just got wider by 100mm

With regards to these nuts on the shaft (the output shaft looks to be about 10mm or 12mm threaded), I had another go of getting the nut off and I just can't. Contrary to what I said a few posts ago, I had a think about it and I really want to crack on with this and if the weather is good, tomorrow will be when the bulkhead panels start going together. I've ordered myself a bench vice and hopefully will have them off by the end of next week otherwise a nut splitter might be needed.