I'm intrigued, but I am unfamiliar with ftpii. What sort of features are you planning to add to USB Loader GX? The ability to load games stored remotely? I'd love to help out, I am a computer science student with grounds in C++ but I don't have much experience working on projects, let alone coding for the Wii.
What sort of help are you looking for? I'd love to help out with the code, though I am a little hesitant about running untested code on my new Wii :-\