Found in the forest at the crash site. Almost all blue trim. Width 0.5 cm armor plate. The machine gun seems to German. I look forward to your suggestions.
Photo #7 looks like it's upside down - from what I can see, that proof mark looks to have a 5 over the horizontal bar with 03 underneath.
As far as the blue paint, it almost looks like a VVS (Red Airforce) color of blue. However, the passage of time and being half-buried may have altered the pigment to a certain degree, too.