Gah! I almost managed Crazy 18, but it winds up being ONE pixel off from what I need... Hmm, maybe there's another way, seems like there should be one...
Yes, I'm almost possible there's another way, working on it now...
Edit: Got it! Turned out to be rather straightforward.
Btw, my method that didn't work was going over the top... but the angle of the bubbles and the maximum height limit for builders makes it just barely impossible, even though you have just the right amount of tools to pull it off. A0;:-(