A friend just pointed out the new rack design feature. I played with it a little bit and thought that I'd offer a few comments. I do want to say that it is a nice new feature, and will help people visualize the bikes more.
1) On front porteur and handlebar bag racks it is common to measure down to the eyelets from the fork crown instead of up from the dropouts. It would be nice if this were offered. Nitto and Velo-Orange handlebar racks and Haulin' Colin Porteur racks all measure this way for instance.