Just a bit more tinkering later and I think I started to get pretty close, actually!
All I'd need is some way to constrain the main body to some point averaged between the two rockers' axes of rotation. Wouldn't be perfect, but maybe good enough with side skirts to hide it
Now i know why the idea of using normal guns was bothering me. These guns are supposed to be for a StrangeREAL world. So they look weird, But they are based on Strange modifications of Real fireams...
Anyways. I changed / added to the yuktobanian weapons. Except for the Smg.