Tall LiPo batteries can be a bit of an issue -- when the car was designed 4200s were about the top and everything fits well. Our shell fits with 5000s if you cut below the cut line.
Velcro is all we've ever used to hold the shell on here in the U.S., but we don't have your U.K. (maybe EFRA??) rule about the body must be on the car. Can't remember seeing a velcroed body come off recently.
Car certainly performs differently without the shell -- there's more to aerodynamics than many think. When you change shells, you change things -- sometimes better, sometimes not...
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