I haven't and I don't know anybody personally that has tried doing it in a large area and have it work. I agree with Santa - more chance of chasing and getting the wind up their tails. The idea behind a small area is that they have to sort it out and aren't as likely to kick off as they can't escape the other rabbit.
I do think, the more bonds I do that the buns are either going to work or not and that sometimes doing things slowly (which might be the case in the situation where you provide more room to stay apart) is only going to put off the enivitable of will they won't they.
But I'm sure that there may be some folks who have had success. I think that this might be due in part to the bunnies actually liking each other from the start so could have worked regardless of technique.
Is there a reason why you want to try a large area?