looks good.

Feed will however push the plywood outward and the grain will seep past the ramp. I might suggest an apron or trim wood to block the feed. You could also look at a square kitchen trash can to reinforce as well as funnel the feed through a slot in the bottom, or series of holes. If the feed tends to pack down and tight, might want to employ some separators such as addition ramps (vision pinball machine) in opposite direction to break up the bulk of the weight packing down on one section. That way the feed is always waiting to fall instead of building up in the corner.

Looks like a fun project.