Would the red part even stick out? Can't you just mount it at the angle like yamatetsu said and be done with it?
[...] I don’t have a smooth transition from the CP to the front kick plate. [...] As a note the vertical rectangle directly under I want to hinge together so it pulls down for a keyboard to slide out.
If I understand correctly, he wants to make some kind of drawer that goes directly above the white board, so yes, the red part would be in the way.
Come to think of it: obizues, you could just make the white board out of a thin piece of wood so that the red part sticking out isn't so big and lift the bottom of the drawer up a bit so that it slides over the red part.