Thanks for all the compliments and suggestions. I will try to answer all the questions.
The grass is model railroad static grass. I spray a mixture of white glue and water on the Styrofoam and sprinkle the grass on top.
I agree the sandbags don’t look very good. I will give your suggestion a try. I also saw a tip on the forum using tissue and filling them with sand or ballast.
The trench support walls were scribed already, it may not show up very well in the pictures.
Nicoropi, I used acrylic paint on the Styrofoam. I used an earth colored basecoat and then sprinkled it with the grass.
As for the gun positions, I am following the diagram below found on the following website:
http://www.members.lycos.nl/bandofbrotherse506pi/dick%20winters%20medal%20of%20honor.htm
Parks20, that figure will not be a part of the diorama. Just as a sense of scale for the trenches.
Salvo, I’m not sure what I will be doing with the back area. I might add another machine gun pit or something.
Mech-Maniac, here is a picture showing the prone machine gunners.

GenAbrams, I’ve wanted to do this diorama ever since I saw the mini-series when it first aired on HBO. When AFV Club released the /40 version of the 105mm howitzer, I then had the main pieces of the diorama I needed.
spooky6, my only real reference for the trenches is the BoB mini-series. It seemed like the trunches were dug in about waist deep, with a dirt berm to give a little more cover. That is what I am attempting to recreate.
Again, thank you for all of the compliments and suggestions.
Tim