Mounting other (rocket) imd into turret gun barrel is not problem, all attachments are displayed correctly, problem is activate rocket gunpoint via gui menu.
when you observe small guns, there is just small gun point inserted via imdeditor into imd of fighter, no imd of small gun with gunpoint is needed. i tried it on model of naginata, there you can see, that model looks the same with inserted gun or without it. I edited naginata imd, deleted all parts connected to smal gun, remains just little holes in body of fighter. With inserted small guns fighter was able shoting, no gun was visible, just fire and outgoing bullets.
And little from another theme, i explored model of Motherstone mamaship (STAS mod).
It looks like some joke, has double and triple parts in imd, textures look unusual too. So i decide made my own joke, Arba-stone mothership
Need finish ref. points, gbnd, etc.
there is just screenshot.
https://ulozto.cz/!G5sSsLhJMXHD/screenshots-zip