Playing with their configurator, there are certain discontinuities: with a horizontal roof, a 1' increase in width is a huge price increase, but an increase in length is very reasonable. With a vertical roof, there is a big price jump beyond 26' in width, and no price increase at all between 24 and 26 feet in length, then a big jump. It must have to do with the corrogated panel sizes - a little bigger and you have to add a whole new row of 12' sheets or whatever. Anyway, play with it and you may get something a little bigger for not much.