I have to admit the rock sliders came out much less detracting than I thought they might when you originally posted. In fact, I see where they could be a produt that I would be interested in purchasing possibly.
As for the diamond plate, I can appreciate a utilitarian approach, but I can't find the logic in thinking that you are going to need that protection over the wheel wells, on top of the hood, but not the doors. And I do understand that you are figuring on the rock sliders taking the damage there, but when I have dented up my ride at that height up the side, the damage extended from the mirror to the rear of the truck.
Of course diamond plate would not help there anyway, but it would be nice to know it was there if I was making my way around a heavy branch or something of that nature.
Anyways, my 2 cents. I think you have a product with possible market impact with the rock sliders if you refine them a bit.