Using the crossmembers, create a horizontal structure that protrudes forward to support the deck up front, that has a vertical member that approaches the ground. the vertical member will be the foundation for the bowed side skirt. For the skirts/body, I had a stack of cheap paneling that was left in the garage. it has a very 70s wood printed on the front side. as you can see it's fairly flexible. this is a deconstruction photo so the skirt has some memory in the shape. it started out quite straight. first fasten the center of the skirt to the vertical member so that from the top the entire thing looks like a large "T". Over the course of 2 or 3 days, I used ratchet straps to slowly pull in the "wings" of the skirt until I could fasten them to the shelf structures on each side. This step looked like a large crossbow as the nose radius was slowly developed.