I've been lurking here for a while, then registered so I could read all the MYOG threads, predominantly this one, because I own the same cookset, and have been tinkering with/pondering on this idea for at least 3 weeks now.
First let me say: Nicely done.
Secondly: It's been a week now, have you been able to put it to use any to see how well it works?

It looks like it would fit between the pot and storage sack for carrying, have you tried that?
Would be nice if it 'disappeared' into the overall package rather than having to roll it up and stash it elsewhere in the pack.