Plus a GUI would only waste ram on things not needed, you're better off coding an admin panel that can connect to the server and give you full control (with proper authentication of course).
Also, why not make the server in Java? It would allow for hosting on Linux (Cheaper). Anyway as for bugs and hacks I could take my attempt at helping out and any other hints / tips. Also, don't forget to use encryption from client to server (why encrypt data from server, we all know it won't be tampered with) and such.