I am really pleased to announce this block works perfectly with only 6 of the estates not covered by the infirmary. This will never be a problem. I feel I've pushed the concept of 'walker-directing' to the limit. I have 2 fountains in this block so I offer apologies to non-duplication purists.
The tricky part of this block was choosing the right length of loop for the vendor cart so that it allows him to complete the loop when he heads into the agora at the start of his walk and when he heads out of the agora at the start of his walk.
This is the block I will probably use in my cities. It has a 20x31 fooprint and holds 4 companies of soldiers and 1920 people. At Olympian it has a 1:1 split of hoplite:horse.
4 of these blocks should be able to win any adventure with unemployment as your only problem.