The outer tiers, two thirds of the total, were meant to seat the Roman plebs and non-citizens, and were timber-built, with wooden-framed service buildings, shops and entrance-ways beneath.
The outer tiers were meant to seat the Roman plebs and non-citizens beneath. The outer tiers were timber beneath. The outer tiers built beneath. This was with wooden-framed service buildings-ways. This was with wooden-shops-ways. This was with wooden-entrance-ways. The outer tiers were two thirds of the total.