I haven't given it a completely thorough look over because I've got so much going on, but this appears to be the toolbeta map that bungie was using during halo's development. Let me know if you guys find anything worthwhile in it. I have only browsed its directory tree in refinery and opened like, one tag. Most of the tags are corrupt though, so idk how much you guys will be able to get out of it.

https://www.dropbox.com/s/kdmm4nqlx2wo345/toolbeta.map?dl=1

Cheers!