Chip,
While you'll have a lot of architects that will say they would never use sleepers for fear of liability. I can' t think of a more nastier way of making a bunker look, play and seem fearsome on soil that deserves it. I also think you need to learn that.
Go research a golf course like Northwood just north of London where sleepers were part of allure to the greatness of golf holes that once existed there (and have been more or less left for dead (architecturally) The holes are not the same. To paraphrase a friend of mine (Robert Ball) 'The bones are there' sadly the sleepers are not.
Chip, to repeat again, honestly, I think you need to learn a lot about golf architecture, but then again, so do I...... So here is a tip to get you started on your way about Northwood: Go read Golf Courses of the British Isles by some bloke named Darwin. You will get the point--hopefully.
Matt, Those are railroad ties, sleepers, at least they look like it on that rendition of Hell bunker. A masterful one at that...