So know there is a list of the items they can craft for you but have anyone figured out how to get their master level high enough? As in what stats is needed from buildings and such where the master is based?

I have no idea, what you mean. In my games the items were really random. Its high-level stuff, but you can get better items later on during the game. The items they brought me didn´t seem to improve later on. Its more like a gambling thing: you never know, what you will get next.
And you cannot level up the buildings up to the highest buildings, as you can only level the areas up to one level higher. And only two of them, if i recall it right. The exception is the artisan in the main city.

What you recieve is supposed to depend on "master level", but you can´t see the master levels, master levels are as far as I understand increased from having high level buildings in the zone the master has his workshop, so if
the zone is crap you will never get the master item for example.