So I am thinking of riding the Mead Roubaix in April. However, I was thinking of building up a wheel set specific to riding on rough dirt roads. Since it has shown that a wider tire will provide less rolling resistance, I was thinking of building out a 23mm rim with 36 spokes, and then use this rim post-race as a kind of bomb proof wheel set for rides where it involves a lot of dirt and/or rougher roads.

What are your thoughts on a good box rim that would fit this criteria. As for hubs, I was just going to get some cheaper 105 hubs.