Thanks for the connecting site!
I noted that the original version also had a partridge hackle wrapped along with the dry fly hackle(s). In as much as the partridge wouldn't provide any flotation, I'm wondering if it provides more movement in the water surface......kind of like 'legs' moving around?! In as much as I'm a hard core soft-hackle fisherman, I like to think that's the case! Ha!
The CDC would provide more flotation IF it contacted the water. That's why I was thinking about cutting the inverted V in the bottom of the hackle much like Vince Marinaro's spring creek dries. ....otherwise the CDC would simply imitate 'wings'. Either way, I think I'll try one of these in an Adams style as noted above. You KNOW it's gotta' catch some fish! .......Thanks for the insight.