I have not spend any diamonds, not (yet) found any dubloons in the daily incidents and all won dubloons from the quest line were invested.
So far I have collected:
- Level 1 Governors Villa
- 4 Upgrade Kits
- I need 4 more upgrade Kits to complete the main building on Level 9
- Currently I have progressed to 11/20 on the sailing route (next price are 50 FP).
What is still open:
- The quest line will add one more Upgrade Kit (last quest 55)
- I am at quest 40/55 so 15 more to got, 15 more days to login = 30 dubloons.
- Quest 45 will add another 10 so I will get a total of 40 additional dubloons.
- With 40 dubloons I need to get 5 and a half sailing tours completed (to receive 3 more Upgrade Kits - assuming that every 2nd price is one). That means 5*20+10 = 110 progress points. Given that the average progress is (2x1 +2x2 +1x3) / 5 = 1.8p I can probably expect more of 70ish progress points, which may be very close to complete 3 and a half round. Adding another 2 Upgrade Kits.
- Finding a few dubloons (none so far) in incidents could make the above more likely to happen, but certainly not add 2 more pass throughs, which would provide the final 8th Upgrade Kit.
Bottom Line:
I can only get 3 more Upgrade Kits and therefore end up with a Level 8 building unfortunately