Sorry for being a necromantic wehraboo again. The custom dunkelgelb skin on the StuG/StuH is a nice touch, but it is historically a bit inaccurate. I guess the idea came from the famous picture of a Sturmhaubitze 42 racing down the Ihantala road:
Spoiler
(https://i.pinimg.com/originals/22/60/9a/22609a71e829304f677aad15d2d6a83a.jpg)
However, this is one of the replacement vehicles rushed straight from ALKETT factory, as couple StuG.Brig. 303 assault guns fell into the harbour, while unloading the cargo in 22 June 1944, Helsinki. According to "Panzers in Finland", the replacements were shipped immediately from the factory and the crews of the sunken vehicles stayed in HKI waiting for the delivery.
Since there are no "middle production" StuG III Ausf. G or StuH 42 in the game, the easiest fix would be camouflage the current "early" StuGs. Most assault guns from StuG.Brig. 303 were assembled in 1943 (some even earlier), numbered and in full camouflage, painted dominantly in dark brown and olive green:
Spoiler
(https://i.imgur.com/0E9KrzM.jpg)
Assembled: MIAG, 11.1943
(https://i.imgur.com/nMQNEmF.jpg)
Alkett, 04-08.1943
(https://i.imgur.com/e29zYxa.jpg)
Alkett, 11-12.1943
It's also worth mentioning that the combat experience of the brigade gained at front in four months prior to being sent to Finland was rather high: 3./StuG.Brig. 303 alone claimed 46 Soviet tanks in the northern Baltic area.
refer: Kuusela: "Wehrmachtin Panssarit Suomessa" ("Panzers in Finland"), Müller: "Sturmgeschütz III Vol. 2", Erkki Käkelä & Panssarikilta