So it took the world 20 years to get its ass up and collect stuff about the development of settlers 2?
http://kultcds.com/Upload/Siedler2/
Anyways. It seems the game originally had more buildings:
Wooden Fortress, Wooden Watchtower, well without hut, fountain, carriage house, merchant building, horses (instead of donkeys, that is). And there was another version of the HQ.
Can you read more from the screens?
Post this at https://www.siedler25.org/
Maybe they'll add these buildings to Return To The Roots.