Ramses and Babel tile 23: are Guilds free or do you have to pay coins?
With Ramses in effect, guilds are still free. This is the reason Babel tile 23 specifies "construction of guilds via resources" is forbidden.

Antoine Bauza (the game's creator) was asked this directly on his forums this past December. The question was posed:

«When we built a guild with Ramses Leader in play but the tile Babel No. 23 (resources become parts payable) is also at stake, what's happening? The guild building is it paying off in parts or completely free in the end?»

To which he replied:

«Your Free guilds remain with Ramses (Free resource becomes free rooms)»