Look at your table, you have the figure 72 metric tonne and then 90,000 lbs for the engines, its confusing!
For your information, we are analyzing the 787-3 as a short range high density aircraft, we need the cargo capacity, so we wouldnt consider your greenliner. Its also worth noting that you are basing everything on the false impression that you can achieve maximum takeoff weight, if not, then your whole equation fails.
Nice effort, but its a fantasy!
Mutt