Hadn't seen this one before but you'd have to have a handy supply of replacement gunners.
Charlie
I would like to model that but I haven't been able to find a 1/72 1pdr pom-pom.
Not trying to be silly, but could an Atlantic machine gun from their WW2 Soviet infantry set, or sone 1/48 machine gun, be a starting point? Failing that, a 3D print upscaled?
A 3D print would be great, but I haven't found one yet. A few 'deck guns' but I think they were at like 1/300 scale or even smaller.