The guns on the back bug me somehow.
I guess they're stubbers or autocannons or whatever, but they don't look like 40k stubbers or autocannons. They look like they're taken from an actual WW1/2 scale model kit. I get that that's the inspiration for the model, but it's being taken much too literally.
Kreig weapons all look like ww1/2 kit over cadian standard
It’s also, I believe, a relatively venerable model, predating the recent proliferation of heavy stubbers on main-studio GW kits.