Undeadenemy

No one knows the answer to this?

So I'm trying to develop my own mod pack for a server a friend and I play on by ourselves, when we last played, we used either Tekkit Lite or Classic. I really liked the Red Power mod and the IC2 mods, so my question pertains to them. As I've gathered there are no plans to integrate those mods back into Tekkit, I would like to add them to my own custom pack. So the question: If running the latest Tekkit, is it possible to simply use the latest Tekkit, but add IC2, RP2, and Aether2? Or will one or more of those not be compatible with the version of MC that the latest Tekkit is running?