I've discovered that my design fits the same number of watermills [with some free space, you will see on map i will upload], but my design watermills has a higher production than yours.
Each watermill tower has 64 watermills for aesthetic, math and convenience reasons. [Same reason that windmill towers are 32 high]
Map : WaterMap (Mass scale)
I can add windmills later to the map if you desire.