Looks like an MG mount to me.....never know 'bout them "Rookies" though! looks like you are making some progress there Dave....nice when everything goes together easily. Rick H.
The barrel goes through the round clamp at the front, the curved rack at the bottom allows it to be fixed at various angles for firing against aircraft.
Hi Dave
Bit late but far too much going on on the forum to keep up with - sorry.
Looks and sounds like a nice kit. Good start. Sorry to hear about your injury. Hope the puss cats let you get on with this
Jim