Nice modification! I had a QX56 with the second row bench but got a QX80 with the captain's chairs. Every so often, I miss the flexibility of have all three kids in the second row and the third row down. But, my oldest is a driver and we're not often all 5 in the same vehicle, so the comfort of the captain's chairs works better. Please post pics of the finished product when complete.
Out of curiosity, where did you get the jump seat?
2014 Q50 Hybrid Sport
2016 QX80 Limited