Has anyone figured out the s3d file format yet?

[Solx]

There seems to be a checksum at the end. It doesn't seem to be a simple sum of the bytes in the file, it will be a week or 2 before I can investigate it further. What is driving me, is that I really want to know for sure what models and textures are in the files, just to make sure we aren't missing out on some of them. But building custom zones that would be neat. Even just cutting mobs out of zones and moving them to other zones would be great.