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Great work! One of the finest projects I have found on Thingiverse.
I am currently using MatterControl to slice and print my stuff and I am getting tight fit on some of the designs. I have found out that Slic3r and MatterControl's own slicer provide tighter fit (to a point where I have had to extensively sand down the design to make it fit with a lot of force), while Cura gives a more fitting results. Cura, at least in MatterControl, is offering fewer settings though.

Any hints on what to do to make the items fit more? I.e. castle wall joints fit snuggly, but connecting 2 walls with it is impossible, there is not enough room there. I am pretty sure this has sth to do with my settings. Can anyone offer hints on this?