I did this with my Giant Schnauzer 2 yrs ago. She passed with flying colors.
I thought the first half of the test was very similar to CGC. It's not till the end that you get into the more "difficult" parts. At our test, firing a gun was not allowed in the town so they had to improvise by clapping to pieces of wood together. It worked well enough.
The stranger part goes against what the breed was bred for and training. This is quoted from the site...

"The stranger is never closer than 10 feet from the dog. The handler's 2 foot arm and the 6' lead is added in for a total of 18 feet. Aggression here is checked against the breed standard and the dog's training. A schutzhund trained dog lunging at the stranger is allowed, but if an untrained Siberian husky does the same, it may fail."