You just need a super simple tray at the top or the right designed spray bars, DO NOT OVER THINK IT!!! Then at the bottom of the screen there is a very simple reciprocating tipper bar that you can make to pull the solids off the screen at the bottom. The key to making it work right is the curve. Some of these are straight, but the better ones have a curve to them. But with a curved one you have to make sure the liquid get on the screen at the very top or 2" down from the top. I have seen some where it is hitting the screen 12-14" from the top, basically wasting that much of the screen.
sorry to ramble.