Besides my previous comments on why I think most of these rules could simply be removed, following that same line, I didn't comment on "entities you captured or converted from another player (or from Gaia) are not refunded", I wonder why this is the case: tons of monumental architecture has been dismantled by conquering states, using then the stone to build in their own style (even the Ayyubids tried to dismantle the Pyramids of Giza, Menkaure's has been left with a big gash since). That's what's great with stone and metal, quite reusable… which makes me think if wood should have some penalty, but also wouldn't want to add rules, my philosophy being the exact opposite.

@Thalatta happy it was not in my code 

Oh hell naw! Just by pressing Learn to Play one can read "Civilisation", no one cares about guidelines . Will consider it for my upcoming renaming PR.

Just something to consider: I don't think there are any examples of ancient sword guards looking like a nihonto's tsuba.

Couldn't you do that through a "mixin"?