It's a good idea and custom skins are always a nice touch, especially when they add to the historical accuracy. However the idea behind having just a generic dunkelgelb skin for the 303 here is a two parter:
1) Differentiating the upcoming finnish StuG's from the generic german counterparts, making it easier for your every day player to notice the difference between the two. Now, Ihantala will not be receiving these finnish variants obviously, but I know for a fact that there are players who dont realise that the dunkelgelb stugs are not a placeholder.
As a side note you are correct about the influence of the StuH photo. It played a role in deciding what texture to use.
2) It being a generic skin allows others to use it. I decided against having unit markers and vehicle numbers just so this would become a generic dunkelgelb skin that everyone can use on their maps.
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While Im not saying no to your suggestion. I like historical details like these, but first I'd need to find a texture artist who'd be interested in doing this and who also has the time to do it, currently our man-to-go Matt Baker is swamped with all sorts of projects. Tbh, I'll just leave this open for any interested texture artists to tackle. If someone comes up with a texture, I'll consider adding it in.
While Im not against the idea itself, I think we will keep the current ones at least for now. If you happen to have a camo pattern and examples on what the StuG could/would have looked like, do post examples here.
One thing I'd like to get changed in the future are the gun mantlets from the box shaped ones to saukopf's.