Quilting on a frame is very different from quilting with a hoop. It seems to me the fan frame would be fine if you want to do frame quilting. Many people find frame quilting surprisingly difficult because most of us have a favorite direction for quilting -- e.g., right-to-left or towards oneself. If you need to quilt a circular pattern on a frame, you will need to be able to adjust the angle at which you are quilting because you cannot re-position the quilt (except to roll it). I do think you might run into sagging problems on large quilts if you use the 1x2 boards, but they would likely be fine for crib size and lap size hoops.
The oval quilt frames on a pedestal aren't ideal for quilting. I prefer a lap hoop. Mine sits on a small stand on my lap and the hoop portion swivels on a wooden ball. The closest I have found to it currently is the Grace lap hoop.