Wow ! It sounds like it is going to be somewhat like Christmas and you will be Santa Claus !
Children are SO much fun. I'm glad you are finally getting to see him and I hope the trip goes without a hitch.
We had Legos growing up, just like everyone else we knew. I don't remember there being so many specific kits, but the general box of Legos was huge, with assorted odd pieces, so what we could make was only limited to our imaginations. The hours we spent playing with them.... too many to count!
I used to have generic piles of Lego as my parents couldn't afford kits. We'd but up containers of the stuff second hand. I still loved it, maybe even more than sets, though. My brother did the same for my nephew and these sets will be the first actual sets he gets. I feel pleased that they are coming from me.