This is that Hoonicorn model I just posted, but scaled down slightly, widened and hollowed out to fit over an XMods Evolution R/C chassis. It's a very tight fit and PLA is probably not the most robust material for an R/C body, but it's no heavier than the stock bodyshell and so it has no real effect on performance. I couldn't get the drive pin shape in the wheels centers quite right, so I had to drill them out and that DOES have an affect on performance (drivetrain loss means I can't get full speed or wheelspin with these wheels on). You can still rip skids when you pair this body with the stock wheels: https://vine.co/v/ej9DTPPddWz
Print the body, front clip, and 4 wheels all with support.
You can find my rough model of the XMods Evo chassis in the .blend file if you want reference for building your own custom bodyshell.