Sorry about the barrel puzzle. I thought where it stopped gave away what you're supposed to do next.
I tried using different sprites besides the barrel: either it didn't fit in and didn't look right (like using an indestructible barricade), or didn't work because it would float past the next platform without stopping, or it would get stuck along the stream bed. If I knew how to make the barrel indestructible, I would have, but I don't so I left that note to the player on the wall of the 1st building they'll see in that area.
I'm going to have plenty of free time, I herniated two discs in my back a couple of weeks ago, and since my back has had prior injuries and several medical procedures performed on it already, its going to be several months before I can go back to work. With my free time I'm looking into redoing 3:16 and making a third map to finish out the series. If I go ahead with that plan I should be done around September-October.
Thanks MRCK for your help and compliments. That abandoned building was the hardest, but funnest to build. And thanks Gambini for your technical expertise.