Hey Bob,
I was trying to do the exact same thing and you hit the nail right on the head on lack of intuitiveness.
Were you able to get much success with this out of curiosity?
I have spent almost 40 hours now just simply trying to get a working example with amazon's marketplace API to no luck.
I will name my first born Bob if you can shoot me the code of this working in action.
Edit by admin: no contact info permitted on the forum, thank you
Any assistance is appreciated Bob.