I don't think the 5e rules are available publicly. If you can find a link somewhere legit (such as wizards.com) then I'll happily put a link up in the FAQ.
As for the older DMG rules that you have, I'll post them up if I end up implementing that version. Otherwise I'll cause confusion :)
As for the older DMG rules that you have, I'll post them up if I end up implementing that version. Otherwise I'll cause confusion :)