http://www.doomworld.com/vb/doom-editing/
and look for the most recent thread about ObHack. You may have to go back a page or two (click on the small link marked “>>”) to find the most recent ObHack thread.
Right now, the last poster to post about ObHack was Fritz, the maintainer. He is doing a a good job maintaining and updating ObHack, and can best handle your concerns.