About the Diorama. The Jeep is the 1/35th Tamiya kit #219, which is a better kit that the their Tamiya kit that includes the MP and trailer, IMHO...
The base is plastic 5x7 box photo-frame (my prefered type of base) with wood strips built up on the sides to contain the celluclay. I first cut a hole in the plastic for the foxhole and lined it with cheesecloth, then brushed a heavy mixture of water & white glue onto the cloth and let it dry with a fan blowing on it. After that, I applied the Celluclay over the entire base, building up the edges of the hole (that dirt has to go somewhere), then started building up the overhead cover of logs and sandbags. After the overhead was complete and dry, I took it back off, leaving the log impressions in place... This is an important detail, pressing the stuff into the damp ground, in order to make it appear to have weight. I then trimmed the cheesecloth back under it, to allow room behind the MP figure.
The damp Celluclay was painted with brown Tempera paint, then the Jeep pressed into it several times to leave several sets of vehicle tracks, and then I dried it with a hairdryer... After the paint flashed, I put the dio base into the microwave to speed up the drying time, pausing it every minute or so to open the door and let the steam out, and to make sure the heat didn't build up to melt the base. After the base was more or less dry, I built the MP figure in my usual "Frankenstein" manner, the torso and head is from a Tamiya set, the legs from Italeri, and the arms are either German or Russian, I don't remember which, topped off with an Italeri helmet. The "Fingers" sign is cut from sheet styrene, and the pole is strip.
The "Military Police-Information" sign is a pair of "popsicle" planks with some basswood strip for a post, and the sign is printed from my PC with Stencil script. I thought about hand-lettering the sign, but figured that MPs would have plenty of stencil kits around since they also have a lot of other signs to make (STOCKADE, POW COLLECTION POINT, CHECKPOINT AHEAD, SPEED LIMIT "XX", and the ever-popular "OFF LIMITS TO ENLISTED PERSONEL" to name a few...
I know I'm not the first to bring Mauldin's drawings to "life" around here, but I've been a fan of his work for about 40 years, and had the pleasure of meeting Sergeant Mauldin about 25 years ago at a 34th Infantry Division NCO Dine-out, where he was our Guest Speaker... I plan on doing a few more as the mood strikes me, and find some that haven't been done already, lol..