Hi TailUK,
My compliments on your build, this is going to be a nice ship!
Something that caught my eye, is your motormount; the motor is completely 'surrounded' by plastic and wood, covering almost all cooling slots.
If you're running longer distances, things will start to warm up, with no slots free, the heat has nowhere to go and the magnets will heat up to the point of destruction.
If you free the cooling slots on the front and sides, the air can circulate around/through the armature, keeping the heat down.
Regards, Jan.