I think the pic your talking about is on dvr's thread, of a gu patrol with a winch behind the alloy bar, noone seems to know whos car that is.
It could definately be done, plenty of room behind the alloy bar, saves buying a steel bar and keeps your weight down a bit. Get yourself a winch cradle, rip the bullbar off and work out a way to mount it to the chassis, cut out a bit of the bar for the fairlead. just make sure the fairlead is mounted solidly and sitting just a little bit out from the alloy bar so the cable doesnt foul the bar.
I plan on doing this eventually, but got a few other things I want to do first.
Let us know how it goes.