Get a copy of all the city pieces STL files. All applicable stretch goals. At the beginning of the campaign this includes files for the city residential buildings, the market, the belltower and the inn.
A copy of the City STL files as the Hear ye, Hear ye pledge plus stretch goals plus all the files from the previous Kickstarter campaign, Sir Cireneg's Border Fort to create a walled city. (this includes the city fortifications and multiple castle buildings, check the campaign page for full details).