Remember this guy?
I don't know why he vanished after doing this but my suspicion is it didn't help fe at all or maybe even hurt it.
Why?
I think he added a bunch of length and a bunch of skin friction (and some weight too) but really didn't reduce the wake area at all.
And in all probability those mods
raised Cd in yaw and yes the poor sap doesn't live that far from me so he suffers the x-winds too.
Were I to do such a project I'd mock it up in cheap cardboard or coroplast first, then tuft test. No doubt, even as smart as I think myself to be I'd find that the first version needs changes to make it work. After all has been proven satisfactory... THEN build it "permanently".