Hi Steve, good to hear from you, regarding the campground you so enjoy. I have been using the 1/2 Nelson for 9 years, and you are only the second person to ask about the compound curves on the lid of my tongue box. Well, the secret is, there are no such curves. We all know that a sheet of plywood will only bend one way, so I made the underside of the lid, kind of like long bows going from side to side, then adding cross members between them to strengthen the lid. Actually the top of the lid is made of 4 narrow seperate pieces of 1/8 inch plywood. Each one had to be cut to fit the shape from center to center, between the long bows, which meant a concave curve on one edge and a compound curve on the opposite edge. I did this to all 4 of the spaces between the bows. This means that there is a glued and nailed joint at each supporting bow, and if you notice, I hid the joints and nails with a narrow strips of wood, glued and nailed to the bows below. Ta Da, there you go, no compound curve, it just looks like it. By the way, this kind of chest or steamer trunk is called a camel-top chest, and it was often placed at the very top of the trunks by stage coach drivers to discourage passengers from sitting on them. I understand that some had a shallow tray below the lid for transporting ma-lady's fancy hats, that were popular years ago.
I would like to know more about some of the campgronds in Joshua Tree, perhaps you can fill me in. Also, if you are ever down this way, which is about an hours drive, just swing on by and we can chat teardrops, and I'll be happy to show you 3 of mine. An actual viewing is worth a thousand words. The coffee is always on, so come on down.

Roly ~~