Hah! It's not supposed to look like it's in his mouth!I think the simpler one book approach is better but yes the picture you used needs some work to have the book seem more like it is in the t-rex's mouth. I assumed you were asking for overall look.
I’d say 5 but I’m not crazy about the layout in the image shown.
Well! Then mission not accomplished.Hah! It's not supposed to look like it's in his mouth!
That works better. It also sets out their hierarchy as sourcebook and supplements.