Just out of curiosity, will there be an option to have a StuG III Ausf. G with a coaxial MG34? Not all Ausf. G's had them as they were only introduced into the production run early 1944 and with a revised Saukopf / Topfblende mantel for the MG mount...however, they did exist. I've read there were a number of Ausf. F's, F/8's and G's that were field converted to accept coax MG mounts, but this was only done on StuG's III's using the box-type gun mantel as opposed to the Saukopf / Topfblende mantel.
I've also read that some late production StuG III's had 2 coaxial MG34's, but the info on this is hard to verify and thus a bit suspect.
Curiously, the StuG IV was never fitted with a coaxial MG34.