yeap. Start by reading the basic tutorials (about 1 hour), then remove the code from your module_XXX.py files. Your game will crash when you launch it. Start learning about what is hardcoded (must be there), put that stuff back in, launch game.. crash... add stuff again... until it works.
then when you hit new game it will crash again... more missing hardcoded stuff... fix that, and eventually you will have a very min modsys with a empty map that doesn't crash anymore
from there you can build the world in whatever form you want. Most stuff is done on the modsys, so you can redesign the game rules freely. Hint: hardcoded menus and scripts don't need code, just the entry (name).
(first time I did that it took me about 2 hours to have my min version of modsys, and I learned quite a lot on those 2 hours)