Huge congrat' to you Chuckles!
I had no idea that such a score was even possible until you posted, then I had to understand "how" you did it... and this drove me almost nut for a week
. Yet, after many hours of mind numbing tests, I found out how to reach the 400 mark.
Most upgrades last 240 minutes (4 hrs). I think that a few ones take more time (the nectar machine for instance). But others take less = yesssss! Namely, "auto water" for the sprinkler, and "auto fill" for the water troughs. Those only take 160 minutes, a tad little bit less than 3 hours. I think this is where the gap between the 300 and 400 score comes from. I tried many variations around the tinker option, but never got good results with it. That's why I went for round the clock (thanks to the motive mobile) "auto fill" upgrades on water troughs. Additionnaly, they are very cheap to buy.
Besides this, my strategy was very close to Annieb and Drift. Meka Tronic was Handy (surprise
), Ambitious, Loves the outdoors, Adventurous and Snob. I had chosen this trait to give more wishes related to buy things or be worth X $, and in combo with her LTW, Swimming in cash. I played in Twinbrook because the fire station has more different objects to upgrade. Meka started as Annieb's Sim. Thanks to all the wishes related to reach level x of skill/career, and upgrade stuff at the fire station, she got enough points to buy Prepared traveller and Opportunist before the end of the 1st week. The 6 days in China were spent to do enough adventures to gain a Visa 3 and at least 1350 ancient coins to buy the Certificate of Partnership (+ 3 days). Thanks to this, the 2 next vacations lasted each 18 days... full of "auto fill". As Tara mentioned it, there is no need to go to France for the Nectar machine. On the other hand, China is a must for the Fortune cookie machine.
She also spent the last days of this first travel to collect as many ores and gems as possible, so that she could produce Supernovium, Compendium and Soulpeace gems back home. Thanks to this, she fulfilled her LTW and grabbed the Motive Mobile, but also fulfilled several wishes to be worth more than X $, have X $ in cash, and be partner or owner of X business. Those whishes, and the fact that she was elated most of the time, brought me enough point for the Food Replicator and the Teleportation Pad. And also, she had no money problem and could buy anything she needed to reach the 100% upgrade.
I should have stopped pursuing those wishes earlier (and rely more on the elated mood to bring LTHP) and could have upgraded a bit more water troughs.