You’ve got a boosted rev too?! I just got one and it’s been great running at 18s. They are pretty fun with that much power and can get up to about 43mph. Bad news is that mine just bricked itself about a month ago because the 100D I was using died sadly. (Maybe because I had it jammed so tightly in with the batteries and the vibrations killed it? Idk) Anyway you probably went the right direction putting the controller on the outside. More room for batteries too! 
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