I double checked the drawings prior to riveting and I discovered I had not paid attention to all the rivet call outs yet, and that there are some flush rivets. So I examined whether to dimple or countersink. I dimpled everything, except the angle. That I countersunk. I dimpled the the front bottom part, the plate, the rib flanges, per drawing.
I also took a few turns of the debur tool in the dimples that lie underneath just to make sure they will fully accept the top dimple.
