I finished the expedition by the 2nd week , got 3rd place and then turned my attention to mining for bucks via the jobs board to fund my 4 star Titanic upgrade (319m Coin / 81.6m Wood). Got enough bucks to convert to the 81 million wood if I can hold off cashing until around Lvl 260.
Little spoken about trick I discovered is to keep your Bucks in the warehouse as they accumulate interest as your XP goes up AND of course don't count towards your warehouse in the process. My 60+ million wood at current Lvl 230 will become 82m wood at Lvl 260. Just in time for the big switch to LPG and 4 berth ships.
Worked out I completed a bit over 4000 jobs just for the bucks ie not including all the jobs to get the 3 stage expedition completed. All in all, exhausted, but so happy I have banked the Titanic upgrade. I also now have enough commodities to make thee next 5 Town Hall and building upgrades. I am set up all the way till Level 260 and even have a savings plan in place for all the coin needed for Titanic. The biggest problem is that the XP jumps 45 million (or about 10 levels) with this upgrade. Need to factor that in somehow.