I built a teardrop based on the profile of a '47 Kenskil. It is approximately 5 x 10'. The walls are a sandwich of 6 oz. glass and epoxy over 1/4" western red cedar; doug fir studs with extruded foam insulation; and an interior wall of 1/4" maple ply. The roof is 6 oz. zynole (with epoxy) over 2 layers of 1/8" baltic birch with a similar stud, insulation setup. The interior of the roof is another layer of 1/8" ply. The floor is a similar layup with zynole but using a sandwich of 1/4" ply. We have a torsion axle with brakes. It weighs about 1280 lbs. without gear and food and is very easy to tow. It is about 5 years old and has certainly seen a bunch of miles. Most of our camping has been in the mountains of the Pacific Northwest. There are no signs of wear or distress save for cosmetic stuff. I think it could be built to a more light weight schedule to save weight/expense.