If you're serious then it's for the best you use a Redcat. They're cheap enough to easily replace, which is a given since the car is going to shatter when it comes back down regardless of who made it.

As for actually doing it....eh I wouldn't. But I value the structural integrity of my RCs so take that as you will. But if you must, just scale one of those plastic BMX ramps up to about roof height, hit it at the top of the rev band in second gear and hope you don't hit someone suehappy when it comes back down.