Replaced the Demo Download Link with the whole Project. Download it for free now 
Should work with 4.9 and 4.10
You wont see big differences visually but its now much more userfriendly and easier to integrate.
I moved the Main Logic to an BlueprintComponent. So when migrating you just have to bind the Controls.
Replacing or adding Meshes should be pretty easy once you spend a little time with the project.
In this video you can see the automatic saving and the new manual method used to translate the Meshes.
Also some new testing Meshes to Build Castles.
[video]
Hope it can be usefull to some people. If you have any Questions or you want to contribute to the development, send me a pm 
Greetings