Here's what I have planned out so far, however, none of this is final and may be changed later. The town will consist of multiple domes, each in their own "sector" (about 4 for now). There is the main sector, the residential, business, and bio. The main sector will hold the "Main Biodome", which will hold things like the entrance gate and hall, town hall, convention center, gardens, etc. It will also hold the train station. This train station leads to different "sector hubs", which from there lead to individual domes. The residential sector will hold, of all things, homes, and also will hold buildings and different things for the residents. The business sector is obvious as to what it will hold. The Bio sector will hold domes which contain farms and other "bio" stuff.
This itself is a massive task, and will require much more planning. I am open for any suggestions, as I am still trying to figure things out.
btw, I do want the biodomes to be as, for lack of a better word, futuristic as possible. If anybody knows any cool and useful redstone contraptions (or just contraptions, doesn't have to be redstone), please let me know. I already have a very cool gate setup, compliments to Viciousvinny, which we use as the gate in Forthwind.