Not sure Dravidian architect or not ,but people were great they constructed Brihadeswara temple,Thanjavur with such fine architecture beauty . ,when each pillar weigher close to 8 MT ,joined together without Cement (!!!) How we don't know
It is standing firm close to 1000 years
Nandi at that temple is biggest in South India made of single Granite stone and approx weight 23 MT