Wait that is the souce of Knights and Merchants remake.
I have been in contact with lead developer (atleast I think) some time ago (exchanging some ideas and expirience) and I got impression that he was verry open in making discusions about the game, how certain things works etc. I even got a few tips and suggestions from him about something compleetly different.
So I suggest that you just go and contact him or other developers if you don't understand some ascpects of their code. I'm quite sure all of them will be able to offer their help to you.
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