I'd packing tape any small holes.. (or even big ones) Heck I used it for windows on the Kid's Eagle II.

As for the Radio I'd Just go get the best Tx /RX w servos you can afford if you think you'll stick with flying..
Brand is a whole mess of it's own.. I tend to go with whatever the Instructor has for a buddy box.

If you are on the fence hard to beat the $99 4ch JR setup..

JR and Airtronics are positive shift so a JR Tx should work with your Airtronics Rx.