I just got back from a conference and took a 23 inch hoop w/ me for my quilt - I balanced the large hoop on the back/corner of a chair that i placed in front of me (I was sitting in a chair that was in the hotel room & used the desk chair. That worked really well. It got me thinking about a floor frame, and I came across this:
[ATTACH=CONFIG]354772[/ATTACH]
It is from the Frank Edmonds Company.
http://www.faersc.com/
I am intrigued because it adjusts to lots of different sizes.
As far as the bulk - I use small clamps that I bought at Odd Lots to help control "the bulk".
Baste, baste, baste, baste, is your key to keeping things from shifting. I also use Sharon Schamber's method - haven't been disappointed since i started using it.