Gui's system is basically SD's diagram upside down.. it's the same tackle.
Since we have a pair of winches free in the cockpit (and an underpowered mainsheet tackle) I tried to set up something to use the winches in that fashion... simply couldn't arrange fair leads to the winches so went to plan B.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"