I wish someone made the WW2-style one, though they were very large and a scale model of one would take up a lot of your layout (not to mention they never put just one in one place). There's a field of them, re-modeled for 'Nam, over at North Fort Lewis, WA. I trained in them as a ROTC cadet, as did my nephew 15 years later. They're still there, I saw them yesterday, but they removed the mid-level 'roof' shown in Wild Mary's photo above sometime in the 60s.
Also stayed in them at a National Guard base in Virginia, and near the Sniper school in Benning, both in the 90s.
At Ft Benning today, they pulled a few of the last ones on post as they were being scrapped, along with examples of other stateside WW2 buildings, and built a "WW2 company street" behind the Infantry museum:
