I was thinking of the same thing on the back of my Chevelle. I can't get it to run through the actual frame becasue I wouldn't be able to install or remove the bar as the body covers the frame. My idea was to use the tube design as a carrier and fab some brackets on eather end to bolt onto my coilover crossmember.
I kept looking for Delrin bushings but couldn't find any. Didn't realize that they were nylon. Speedway Engineering has a large assortment of solid and hollow bars in deiiferent lenghts and rates.
Here is a shot of my coilover crossmember. Thats the old 10 bolt. I have a new moser going in there. In order to get the shocks enough travel I had to into the trunk a few inches. I figured I would hang the swaybar tube off the crossmember...