Man, you got all the toyz!
BTW, you mentioned in the vid you didn't know what the little rod above the bbl was for. Same purpose as the "Stacking Swivel" on a Garand. To keep the action out of the mud and to keep your rifle handy when you set it down, 3 rifles were stacked in a tripod pattern. On the Garand the swivels were linked together, on the MP/STg they used those rods the same way. I would assume they are all bent because at some point Ivan jumped out of the bushes with a PPsH squirting lead and the German soldiers were not very gentle when yanking the stack of rifles apart!.