[mistercrash]

JThiessen, thanks, it will help a lot.

brian015, yes what you explained made a lot of sense. This last concept was to try to have simpler chassis rails, they are basically bar stock cut to size and drilled in the right places for screws and bolts. They would be so easy to make and so much cheaper in price for the raw material. A solid one piece lower plate was in my first concept but I thought that having a separate front, middle and rear is also interesting. The front and rear plates usually wear out faster than the middle, when they need to be replaced then you don't have to replace the whole bottom plate. Even though they are separate, they do overlap each other which brings more stiffness and strength to the chassis as a complete unit. Also, I plan to use long M4 screws that go through the bottom plate, the chassis rails and the top plate with a lock nut on top to sandwich everything together and lock every part as strongly as possible. I'm still just playing around with ideas so keep on giving your feedback, it will definitely help me to come up with a final concept.
And please tell me if you see anything that couldn't possibly be done because I still don't have the truck, I'm just figuring out stuff just by looking at pics from other builds and exploded views.