Homebrew PCBs

I was looking at an easier and more reliable way to etch PCBs. I know 
from experience that bubble etching never produces acceptable uniformity 
and often needs manual brushing to finish it off.

I though maybe the bubbles could be released on one side of the tank 
causing etchant to flow in a circular path around the tank.
The PCB is held vertically in a frame that pivots by two small shafts at 
either side. The moving fluid should continuously rotate the PCB around 
thus guaranteeing uniform concentrical etching. I'm not sure how uniform 
the etch rate would be radially.

Has anyone tried making such a contraption ?