Greg -- Thanks; I am sure I'm not the only person who will be interested in what you learn.
I'm planning on having my interior guy perform a full re-do of my soft top and frame over the winter. Here's what I'll be looking for as an outcome from that little exercise:
1) Use of a modern mat'l, perhaps like the type used on new a CLK cabriolet's soft top. IE, keep a fabric "feel", yet absolutely water proof.
2) Elimination of that pesky curl up problem ... while hopefully doing away with the need to manually fold-under the "wings". In other words, our goal will be to just shove it down into the boot, close it, and forget it...And to then have it come back out, after prolonged periods of stowage, fitting just fine.
3) Seal-up of all gaps possible between the frame/seals and the body. Currently the front fit is excellent, but the rear areas have significant gaps. Our objective will be no water intrusion through gaps, none, just like a new CLK cabriolet (or as close to that as humanly possible).
4) Figure out a method that will allow the soft top to be stowed without the light-colored outer material picking up those dirty/grimy marks where the soft top's material comes into contact with the inside of the storage boot.
5) Be able to do a one-hand close all the time...overcome that old & aggravating issue of canvas shrinking (while stowed for prolonged periods) and then being difficult to snap into place when the soft top goes up.
Now, I strongly doubt this one will ever happen, but if there was any way possible to put a motor drive on the top then I'd be for that too!
Tom in Boise
'71 280SL 4-spd, signal red w/lt. tan interior, restored/enhanced