Alright, the big day! I brought corpsy into the garage for building and the first layer of mache. Here he is, laid out in position on some plastic sheeting. My mom was worried I was going to mache on my dining room table, but I'm not sure he'd fit even if I were dumb enough to make that big a mess on my table. Anywho, I put the spine in the pelvis and taped it down, then I put the legs in the hip slots and secured them. The arms were secured to the clavicles.
Now, the mache. I checked a number of recipes and finally settled on a mixture of 1 part flour, 2 parts water, and a touch of salt and glue. The salt is to help prevent mold from growing, the glue is to help support the flour as an adhesive. It came out about the consistency of a nice cream soup. The mache was done by dunking a bit of a strip of newspaper into the paste, gently wiping off the excess, and layering.