Hi Dan - I couldn't listen to the audio for some reason, but a few comments on what I saw. Structurally, I like the starting point you've chosen as it does help to enable the stretch of the skin and emphasize the rooting of the feet and lengthening of the spine. However, I think there's points where you're breaking the connection of hands/middle/feet - which will have the effect of disrupting the skin stretch. Since I couldn't hear the audio, not sure where you're bringing breath or air into the equation, but that along with posture certainly help the initial stretching. When you have those things all triggered together, you get into the "one part moves, all parts move" gambit and can better self-check that you don't have any wrinkles in the skin drum
Nice starting point of discussion, though.