Just had an idea pop into my head that shouldn't be too hard for you to mill/engrave out. What if you took the base from R4, but for the top instead of putting a matching pattern into it, just do vertical bars across it (vertical being the short way). Instead of having a criss-cross flow of the top and bottom together, you would have criss-cross flow in the bottom, and in the top you would have water coming up, then pushing back down into the bottom to stir things up again.
|