I havent looked into it, but most of the time it is just a bunch of scripts that perform the installation. Some are more complex than others.
I remember when I reversed engineered Amiga In A Box (AIAB). Its author made a whole kind of spider web like series of nested scripts. Difficult at first sight, but not so much when you finally understand the logic behind the desitions the author took.
In this case, I am sure it is not so difficult. It just takes time.
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