First, Tekkit is a project name, it takes the mods ported from _This_ website and bundles them up, with a RB bukkit build. So, it should just work.
2nd, And you dont have to read this, It is more like a FYI.
Tekkit is programmed in a way so you cannot connect to a tekkit server if you dont have the tekkit client. And to get mods working with the tekkit client, That are not in the package, seems like a weird process. And thus, i do not recommend tekkit.