It's possible to make any theme based mugen. All you have to do is look at all the tutorials online, and all the files on the net. Tools like fighter factory, sounds good, and gimp make it possible. I have a friend who isn't good at fighting games either, but we still play every now and then. To me, it's all about having fun. If you decide to build your own, check out mugen nation. They have a great forum, and wonderful support.