RE: Rx Upside-down - bad idea? Mounting small servos?
I wouldn't worry a lot about the servo connectors, especially if you wrap the rec. BUT I would worry a lot about the crystal falling out. I've seen what happens when a crystal loosens up or comes out and it isn't pretty.
I'd at least suggest that you put some tape over the crystal to insure that it has a good chance of staying in. ENJOY !!! RED