Certainly sir! It's actually incredibly easy to do, I will simply give you some info, and you can pick what you want to do depending on your taste. Plus I didn't save my files when I patched so I can't show you what I did exactly.
The only file you need to modify is your export_descr_buildings.txt. The two sections to pay attention to are the
building core_building and
building core_castle_building areas. If you scroll through there, you'll see the line
convert_to #, with
# being a value from 0 to I think a max of 4.
Basically each line for each entry corresponds to the level of the other type of building. You can load up the game and look at some cities and use some cheats to see what corresponds to what, and from there you can make a list of what you want to convert to what. I think I added
convert_to 3 for the mid level (stone wall) city and
convert_to 4 for the 2 largest city wall types. I did also tweak the castle conversions a bit because I felt those were off.
Experiment with that until you find something you want.
Also, I did a custom free-upkeep setup too for castles and military units.
Foz has a link to something in his sig if you want something to start with, I just did my own from scratch. All it basically is, is editing your
export_descr_units.txt file and adding the
free_upkeep (I think that was the flag) line to the units you want to fall into this category. Again, it's personal preference.
Cheers!

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