A reasonable discussion of half and whole diminished as dominants exists on my theory for guitar page. It's a shortcut trick with massive amounts of information. Free, believe it or not.
http://members.tripod.com/~griphon2/index-6.html

Another page is dominant triads for guitar. Great for country players. All shapes in all inversions.
http://members.tripod.com/~griphon2/index-20.html