RTF is a global modification that replaces all towns in the game.

Will anything be borrowed from there for the mod of this theme?

I would take the sea elves; judging by how they stand, the model is taken from the elf archer, so attaching a bow won't be a problem.

Added 5 minutes later

Oh! Excellent, I've wanted a city in Heroes on this theme for a long time!

I would mix this city with the swamp lizards.