Here it is! (I've attached the separate icons)
Since I am no authority whatsoever regarding the actual data of the actual thing, I'll let you have your way with the orbat entry!
I think you can get info on the RH503 autocannon
on this Rheinmetall page.
I've also included a totally fictional improved variant (Marder-2A1 I guess) with add-on armor that makes it look slightly more like a Puma.
The winter camoes are hardly worth anything, I'll redo them at some point and repost them.