I think they look great thanks for the instructions.
Just one point I bought some hose pipe rather than water pipe and it is too flexible so I had to go out an get the stiffer type. So need something that will bend into a nice curve but not which will sag in the middle.
I also notice that you have the square base braced at the corners.
Would it be possible to have the exact lengths of the wood and plastic pieces. You say whatever length you like but actually there is an optimum and it would be nice to start with a tried and tested solution. Please can you describe a bit more about how you staple the piping to the base.