I love those pontoon units. It's interesting to see the buildings on a base vs. buildings directly on the terrain. I normally prefer the buildings right on the terrain but here the based terrain has a sort of advantage - I find that when the buildings aren't as dense based buildings looked better. For instance you've got dirt and grass yards on the based units, which makes the whole look a bit more unified. The buildings right on the mat look unified, but less so; they look more like buildings on a prairie as opposed to buildings in Central Europe. Maybe you can just paint the walls brown to make them more "Eastern?"
We were talking about modular terrain on another threat about WW2, and I think that your modular village would work very well for something like that. Some interesting potential in that...
Ok, during waiting of the printed gaming-mat, i did already a correct scaled digital setup (so i can see, where place the units at start), how the mat, including the units in correct scale, should looks like.
As you can see, there should be enough room to move/maneuver the regiments/squadrons.