You have totally lost perspective. This post isn't about YOU or your bike. No doubt you are an expert bike designer, expert builder and expert at getting great inexpensive parts. The point of this forum is to respond to the OP who is none of these things. He and his wife want to START biking. It is ridiculous advice to suggest that he build a one off, half baked, untested design as his first bikes! He wants and needs some real world practical advice - like I and others gave him: get a MTN bike, put slicks on it and it will be an adequate, but not great, road riding bike.