Thanks a lot for your comments, guys!
Kaz you could run with any one of these scenerios and it would work just fine. Maybe leave the option open for the builder with all three heads available, etc.
Ski, Yes since I'm working to make it commercial, I want it with 3 optional heads. As a consumer whenever I buy products I want re-usable option.
Steve and Mario, I understood your opinion, and you are right, officer and pistol always fit perfect. I don't want to ruin my first idea (and my MP35 too), though , which is very important to me. But it doesn't mean force my idea to people when it is commercially available, of course I don't care people use it as a conversion base, change arms, equipments, and guns. I leave users space to make it easier to create their original version by separating arms, hands, equipment, and dog.
SG, I cannot choose one too, thats why I built 3 heads.
and thanks for the comment on details. It still needs brush up a bit, and I'm going to add iron cross and police units badges on left chest and arm.
Sokol, thanks for doberman info, but I cannot read German I couldn't get what " Schutzhunds from III to X" mean.
and... I'm glad you like Bergmann. "Bergmann and Doberman", you know.