Mounting a winch is uber-easy! I'd recommend tack welding a mounting bolt on the ARB to the bar or frame, and tacking one of the front mounting bolts for the winch to the ARB. That way, no one can unbolt the entire winch or bar and make off with it in the night...unless they have a grinder or chisel and want to make a heck of a lot of noise.
Which winch are you getting? Saw the pics of your rig! Looks NICE!