Thanks for the compliments!
The bases are actually 3/4" square, which I think is also close to 20mm. I haven't played with any rules set yet, but the first set I plan on trying out is Field of Battle by Piquet. The rules suggest four bases to a unit, but I'm using five for several reasons, not the least of which is that it simply looks better to have the command base in the exact center of the regiment. The game also suggests a unit frontage of 4"-8", with 6" being ideal. Since mine will be 3.75", I intend to halve all distances listed in the rules, and it should work out okay and allow me to fit more units on the board.
But the basing should work okay for some of the other rules I've looked into, like Regimental Fire and Fury.
There are a couple of green flags in there. I originally intended to have two flags in each regiment, one national and one green regimental. And the first regiment I did had two. Here are some closer up pictures so you can see:
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But I ended up abandoning that plan for a few reasons. First, the GHQ infantry packs are 24 figures, plus three command figures. So I was using three packs for each two regiments. But that only leaves me with three flags to split between two regiments, so not enough for two flags per regiment. Also, the standard bearer for the firing unit is in a standing pose and is kind of wide, so there wasn't enough room to fit two of them next to each other.
Not to mention that for the firing units, the standard bearer figure actually has stripes modeled onto the flag. Which is really great and makes it much easier to paint if you're doing the US flag, but doesn't help much for a regimental flag. And I'm not a great painter when it comes to freehand painting images, especially on wavy flags.
The marching unit also has a green flag, but it's rolled up so it's harder to notice, but was much easier to paint. And in general, the US flag stands out much more than the green regimental flag, so if a unit was only going to have one flag, I figured it would look better to have it be the national flag.