Hi Jay, welcome to the Rottweiler lovers world.
I got my dog from Russia, he is 14 months now, he is doing great(except for some issues) he is just as you described your dog, but I learn here a lot of stuff regarding this subject and I realised that I hadn't tested his protective instinct yet and I think that he is still young.
One of the things that you have to look at is fear biting, this will change your prepective regarding this issue, also take a look at the articles on this page
Learburg it has a lot of good information.
By the way , your spelling is very good.
Please post some nice pictures:)