You said that you are going to use a radio from a crashed (wrecked trainer). Salvaging parts from other aircraft is fine except that when you say "wrecked ", well, that covers a lot of area.

The battery pack, in my opinion, is ok, but I would opt for something slightly larger. I am pretty consistent with using 1200mah NiMh packs, but my packs are 6 volt (5 cell) because I use the DX7 system and prefer to have the higher voltage whick avoids any problems with RX re-boot due to low voltage. But, I would go higher (personal choice and not an absolute as I'm sure someone will point out) in capacity.

Regarding the receiver. Depending on the situation, if the aircraft it was in was indeed crashed, I would send it back in to the manufacturer for a quick look to make sure it is not problematic. If you read back in other posts, some RC'ers have used receivers from crashed aircraft and had no problems, yet others had serious problems, and as it turned out, there was a receiver problem (hairline crack or defective crystal, or some other issue) directly caused by the crash. It is far better to make sure that the receiver, especially the receiver, is ok before going any further with it in another aircraft.

As far as 2.4 GHz is concerned, well, I favor these fine radio systems, my personal preference is the Spektrum series (I own the DX7 myself and love it). There are others. Tower Hobbies, for instance, has the Airtronics RDS8000 on sale for I believe $229 with an extra receiver. And of course there is the Futaba FASST system, but I am neither familiar with it nor do I favor Futaba, being an Airtronics / Spektrum type, but I'm sure it's a fine radio system.

It all depends on what you want to do and if you want to get away from the 72 MHz systems.

But, do consider sending that receiver back for examination to make sure it is ok to use.

As far as servo's are concerned, well, only problem with using "used or involved in a crash" servos, well, they can and do chip teeth in the gearing. You may want to make sure they are ok to use before actually using them.

And, most servos are cross compatible with the most popular radio systems out there. I have a mix of Futaba/Airtronics-Z/Spektrum servos in my aircraft and they all work just fine.

CGr