I deal much of the time with mineral earth, not a lot of organic component. When I can I get some material from other places, that MAY include organic (sticky) soil.
My screen, or grizzly began as 14' 6" by 2" C channels. with plates welded to each end. Each plate has 2 bolt holes. They came from some sort of carpet racking in a warehouse. A customer closed his Long Island carpet business, brought all this with him to VT. An ugly divorce ensued, & he had to empty a barn.
I arranged the channels in a heavier channel frame & bolted them in place. It had two legs held to the roughly square frame so I could easily alter the pitch as needed.
It worked OK, but staying at the same angle all the way to the ground wasn't ideal. It needed a vertical wall at bottom.
After the violent flood of 2011, the whole thing was lost for months. I eventually spotted a small corner 2" tall sticking out of the rocks, otherwise it was buried. It then got a major overhaul. The ribs were cut at 2' & welded back together at 45 degree angle to create a vertical wall dirt could pile against one side, rocks on the other.
If I had it to do over, spacing would be 4" at top, 5" at bottom. Rocks tend to wedge between, & i have to use a sledge hammer to free them.
I have a cross brace of angle welded to each rib mid span. Junk, tree roots, rocks & occasionally sod collect on it & have to be removed by hand.
I've tried chain link fence as a screen over the whole thing. It ABSOLUTELY does NOT work!
I pick bushel sized rocks out before screening. the screen separates gravel from 5" & larger rocks. I would like a secondary screen to fit over it all to get rid of 5 thru 2" rocks. Each size has its application.