As for now, heat is not a problem, at least until late spring here. But I have forseen cooling holes (for motor fan and ESC fan), as seen in my design screenshot. It should be covered with some type of dense mesh (anti-insect type or similar). Even a little mudguards around these holes would make some more protection, but I don't think it is very necessary. Also I think, there should be effective to make a few vents on the top rear of the shell as seen in Jconcepts Traxxas Slash overtray (as seen in attached pic). I think these should be facing towards the rear.
