I assembled the Bridge Bag this evening.
The sleeping bag hangs fairly flat when not loaded.
However, when I'm in there is just a bit of banana-ing. Not so you'd notice when you're in it. In fact, it's a bit more comfortable like this so I didn't adjust the vertical lines to compensate.
This is what it looks like from inside with the cover over. I can zip it up or unzip it while lying there. I can sling the cover over the side (it doesn't touch the floor) and I can lie on the closed hammock. I can also untie it and assemble it without the sleeping bag.
View from Inside
The liner takes all the load and there is a little space below so the loft is not compressed. It's warm all over and under.
A quirk of using the suspension lines instead of a sheet of fabric is that I can get in by stepping through the lines astraddle the bag and sit down into the hammock.
In a previous picture, you can just about see that I had temporarily drilled holes in my spreader bar. I plan to source this at site and wouldn't want to have to drill holes in the field, so I made these end caps from tubular webbing.
Below is a closer look at the end cap. You can see how I stitched over the end providing a tunnel for the line to go through and how I locked the end cap in place with a figure-8 stopper.