Great see-saw. If all I saw was the pivot point, I would have thought you were making a trebuchet. Don't think you need to worry about it coming apart anytime soon! Nice seats. I'll bet the kids are thrilled with it!
Lots better than just a wood plank thrown over a horizontal piece of pipe!
I just finished building a seesaw for my brother's kids. It IS just a plank across a pipe, which is why I didn't post it. I also think mine is too high in the middle, after looking at yours.