Hmm, I looked at a lot of frames when I was buying mine. I don't recall seeing a frame where all the rollers are in a single line. Seems like all the ones I looked at had the backing and take up rollers on the top and the rollers that held the top and batting under the frame. The handles are usually on the top, OVER all the rollers. (take a look at the Grace site's photos:
http://www.graceframe.com/site/machineframes )
Looking at the Strima frame, I don't understand how or where the batting would go. You can see how they have the top and backing attached, and the roller in the harp of the machine is the take up. Even if you just floated the batting, it would lay over the handles, which are mounted at the base of the trolley. I would want to see this in action, either at a dealership or a video. Maybe you roll the backing and batting on the roller together????