I'm a huge fan of the Diablos (yes, even Diablo III), and I have always wanted to make an isometric RPG. I already got some of the basics down, most importantly the basic map handling, just waiting for SDL 2.0 to come out so I can get it running on decent fps. Now, I've been thinking about making it an online game (as in anyone can make a game and 1-2 others can join). Would it take huge efforts? I have no experience in C++ socket programming, even though I figured I could just learn SDL_net.
Would I need to code everything with respect to multiplayer, or can I just add it later through some hacking?