The airplane is not the issue or even its idenity most trainers will do the job just fine and the engine is fine. What is the issue is the electronic components in the airplane. Its a bit more involved than just running out and buying a Tx. You need to know exactly what brand the Rx is and if it is a negative or positive shift rx, possibly even a selectable shift rx The exact frequency and some others issues also thereare wide band units out there that are a liability as well.

Electronics including the Tx are the single most expensive part and of great importance. Even if the electronic equipment in the airplane is junk (For example Rx's that have been crashed in other airplanes) the airplane and engine is probably a good buy but its important for you to understand going in that the flight electronics may or may not be usable for you.

Mixing and matching of flight electronics and Tx's is fine and common if you know what the pitfalls are. there are many. Get someone knowlegeable to guide you through this and get info on what exactly is in the airplane.

Its for these reasons I always recomend that new folks start out with new electronics expecially if they do not have someone who knows mentoring them. Full packs of all the electronics including the Tx can be not much more expensive than just a Tx alone.

John