adam wrote:
You do realize, a frameless still has framing on each side,
but not mounted to the glass, and also usually a sloped sill for
water run
off back towards the unit.

Thanks for the info, but I think you're talking about a
"semi-frameless" shower door. Mine will have no frame anywhere, and
just three or four hinges connecting it to the wall. Do a Google Image
Search for "frameless shower door." Here's an example:
http://www.showerdoorcanada.com/photos/12.html

Do these hinges also just require a stud?

Thanks,
Mike