I ran across this picture I have of one of our camps in 1965-1966. It is appropriate to the discussion you were having about this year's displays. This picture shows why I thought your camp at War and Peace this year (in a smaller scale, of course) was authentic and reminded me of An Khe when I first arrived in Dec. 1966, including the barbed wire entrance with security, sandbag bunker and trench displays. You guys should be proud that you are recreating authentic scenes in your Living History group, especially on your "budget."
On another related subject, James asked me about the construction of a simple Vietnamese hooch. I found a picture of a Montagnard hooch we encountered on one of our patrols that might fit James' thoughts on building an A-frame type hooch which could easily be made, dismantled and discarded. It would obviously have to be smaller than this, but I think it might be something to kick around in your planning.