Maybe you can find some older versions. The starting point for this project was a demo world created by swifterik [YouTube account). There is a long thread where he [EDIT Jun 6: he = Umbawa Sarasong] regularly posted his progress on the project which may contain references to older versions.
If you are interested, I believe the swifterik demo is still online and is still fun to play.
And there are other developers in this forum who have been working on the same kind of project that might be worth a look. [ADD Jun 6 here is one example].