Purchase, renovate, and sell a couple of crappier homes before you do this. That way you can educate yourself on the process from start to finish. It's not often that an "education" generates a profit, but if you do it correctly you'll get all the first-hand knowledge you are looking for - and even if you break even in the end, still gain value by learning how to avoid making simple, stupid mistakes on your "final product" you guys are talking about building here.
The quoted feels like a red flag to me about "not being able to finish what you start." When, in reality, focusing on those tiny details is a perfect starting place for you to begin your education; moving on to bigger, more complicated home-building concepts as you go.