Looks fine to me, but then I've seen it elsewhere...
http://www.themodernantiquarian.com/post/76776/dolmen_les_trois_pierres.html
http://www.themodernantiquarian.com/site/890/haroldstown.html is a better example.
Thanks, which goes back to my question who's to say what's 'right' or 'wrong'? An overlap might offend some aesthetic sensibilities, but that doesn't necessarily make it 'wrong'.