The quick reference card lists "one manual, a building card, and this data card", but the extra downloads here on GOG don't include a building card, which if I recall listed all the building numbers: costs, income, other bonuses etc.

Not sure if this will be of any help.

gamefaqs.gamespot.com/pc/925823-dungeons-and-dragons-stronghold/faqs/45960

I'm a couple years late but I hope it did help! I wrote that FAQ what feels like 100 years ago, and it's nice to know someone looked at it! :D