architect for motorhome -- 2

I am seeking the help of an experienced architect to help me design a motorhome of roughly 20-30 feet in length. I have a general idea for the layout and design, but I need some assistance in bringing my vision to fruition. The most important feature I am looking for is an efficient use of space, although aesthetics and longevity are also important considerations. With the right architect, I am confident that I can create the perfect motorhome for my needs.