@Joseph Beilke if you don't have any new construction/custom home experience I'd be VERY careful. I'm going to be blunt, it doesn't sound like you know what you're doing which = money pit. New construction is very complicated, is the lot buildable? What type of house will it support? Certain lots/land *require* certain types of homes (for example, two store full walk-outs vs. a rambler/ranch), soil, easements etc. and that's just the land! A GC is not responsible for making decisions, what kind of *materials* are you going to finish in? What architect are you going to hire? Blueprints are copyrighted, you know. Builders don't just wake up and say "hey, I think I'll get a better ROI so I'm gonna build me a custom home! and keep commission!" Then you have to stage it and design it and did I mention the materials that everyone wants (granite, tile, etc.) are expensive? What price point are you at? Can you pay the holding costs on the land and the home? Your GC has to *know code* and get approved at every stage from the city of the construction process. Do you have a support team in place? This is very difficult to do, especially if you have another job and you're not moving into the house. Financing for land development and construction loans is different than a flip. I'd tread very carefully. This isn't just as simple as get a GC and you're ready to go. Subs cost money a lot of money and there's timelines and timetables and like I said - each milestone has to get city approval/code.
Also, imagine you get to the stage where it's done, do you know interior design? Did you pick the right colors? Buyers have very specific expectations with new homes vs. existing homes. You are now competing with national builders with a reputation. They will be like "who's this guy who built one house? is it safe?" that's what they're going to think. Builders have designers on staff. Depending on a price point you really really have to select the right materials -- it's super important. Even lighting has trends.
That said, if it's really what you want to do - and you're smart and have knowledge, go for it!! Good luck!!!