Here are my purchases as of this point in time. This list includes 5 animal companion hawks, owls and bats for fast alert.
This is 2K on the dot.
Spoiler360 CR, 14 days: 1008 GP
40 CR 4 spearmen, 20 CR 4 grenadiers, 13 CR 5 serjeants, 3 iron golems, 19 “mechanics”
500 ounces oil: 50 GP
73 long spears: 365
25 slings
40 pounds powder: 500
18 shovels: 36
3 handaxes: 18
150 feet hemp rope: 3
While I do plan on demolishing the fortifications, I do not intend to make it easy, as they will suspect a trap if I don't attempt to fight.