FYI, Because you provide your software under GPL you are encouraged to share the source code to your application openly. Requiring users to register or otherwise request access to the source code is a blatant licensing violation. If you feel this is inappropriate in your situation you should consider a less restrictive license.

That said, I'd be interested in helping on your project. I have 10+ years of professional c++ experience with a focus in building highly available, fault tolerant development frameworks. I'm looking for a project to work on in my personal time and see potential in this one. Thank you for your consideration.