With everything back together, your fountain should look kind of like this. You may need to do some more testing and adjustment.
Using some rope, secure each bamboo upright to a piece of scrap wood or bamboo behind the frame.
I found I needed to straighten out the spout end of the tubing by inserting a short piece of 1/2″ PVC pipe. The pipe is in the spout. The tubing is inside the pipe. This helped direct the flow of water better for me. Your mileage may vary.
If the pourer doesn’t dump water out after it fills, the back of the pourer weighs too much. You may have to saw some off.
If the pourer spills its water but then doesn’t flop back into position, the front end is too heavy. Either trim some off the front or add some weight inside the back end of the pourer.
In closing, this project requires a fair amount of testing, fiddling, and adjusting. For me, the end result was worth it. I hope you enjoy it too.