Very nice looking specimen.
I did this with a bat I found once. I covered the cadaver with a few smaller rocks and one big one, tucked behind a hydrangea in the garden, out of the way of, well, everyone. I went back a year later, and the rocks were undisturbed, but there was no skeleton. Weird bats are.
Great project!
I think I would start by finding a mounted fox skeleton at a natural history museum or something and taking loads of photos. It looks like an Airfix kit without the instructions