Design adjustment...
I glued on some side boards and glued rubber skirting to those. The test was not favorable, too much spillage and hard to place the skirts without creating too much friction and influence on the belt.
So, I have decided to try shaping side roller like the single set in the photo.
I have already cut a THIRD belt to be full width of the end rollers. I'm going to need a pretty wide belt in order for it to curve up into a concave shape to hold material. I am probably going to have to find a thinner belt material that will curve easier.
Jim