Ok, mirrors and hashes added for almost all SCP builds. I gave it a test run, and two of the builds were corrupted on the first try, but not on the second. Kind of odd, I don't usually get corrupted downloads from the mirrors.
Also, it seems only the .zip files are extracted, is there any plans for support for Bzip2, Gzip, DiskImage, 7z, etc support? Otherwise we'll need to go back to zipping all FSO builds just for the installer which is really inefficient.