Oh, okay! No mechanical differences other than leanings in preference? For example, will elves have the same pop growth as the other races? (I'm not familiar with the setting!)We will not be doing other races being better than others, what we can possibly do is to have a trend towards specific profession (e.g. if halflings could choose between being a farmer or labourer pop, they would pick labourer)
The idea of custom building like "dwarven iron mine" is not a sustainable approach as it means duplicating A LOT of buildings for every single race