Haha, the building takes a few play-throughs to get used to doing it on the fly.

But another example of how the building is soooooo effective is, I was playing with a group of my friends and we were squad up running and got ambushed from a hill to our right so we quickly put up a wall, to find out where they were exactly. One of our teammates got injured so we built walls and had him crawl behind cover so we could revive him. Then We slowly built walls (using them like shields to get closer to the enemy) and then another squad came in and ambushed them from their left. So we had a choice to make, to help the enemy of our enemy or to go for both of them, so we took the lower road straight TDM and killed everyone lost 2 teammates in the process, but it was one epic fight indeed.

You can using the building aspect to make stairs to climb up mountains as well, really great tool and because of how the game has been designed I don't think PUBG can implement this type of system, but then again I could be wrong.

Oh and you can basically redesign a whole house by building making it into a fortress of sorts, really effective when you're around the last 15 left alive.