Buddho,
First let me say that I really like this little dio, and I like how you incorporated the suggestions of others to improve the product.
I only have one observation from a guy who has been a mortarman for many, many years. When a mortar fires, all the force from propelling the round it directed into that big, round baseplate. Typically, the first round or two that is fired will drive the baseplate into the ground (we call this 'seating' the baseplate) which is actually advantageous, because it makes the whole platform more stable. In fact, when we fire the first two rounds from our mortars, we have one of the ammomen (they're expendable, right? ) stand on the back edge of the baseplate to add their weight in driving it into the ground. I'm not sure if that was standard practice with the Germans back in WWII or not. In situations where the ground is frozen, rocky, or otherwise too hard to seat the baseplates, we'll stack sandbags, sandfilled ammo crates, tree limbs, etc under the baseplate to give it a seat.
So looking at your dio, my first impression is that this is a prepared position recently occupied and they are firing their first mission. Not sure if that was what you were going for (or if it even matters) but I thought I'd share my observations.
Again, a really impressive little dio.
P.S. The camo netting over the gun pit is pretty standard - they would have pulled it back just like you have it (or in some cases fired right through it...)
P.P.S. Ooops, I lied - one more comment. That ammoman standing just in front and to the right of the mortar tube. Odds are he would not stand there, particularly with a live round. There is a pretty good shockwave coming out of that tube, and he stands to get the brunt of it. You might consider moving him back a little so he is behind the tube. (In case anyone thinks to ask, the guy dropping the round will duck down below the level of the tube to avoid the shock of the round exiting).