Hi thanks for replying, I Plano. Using steel to fab the tray and want to profile it to suit the Cab lines. It will be for looks primarily, but am planning on it being hydraulically supported and tilt able with a timber floor. My Son in Law is a good welder and will be on the stick. Currently has a top notch all ally tray with sideboards.
First thing then is the hydraulic set up and hinges for the rear, then make the base frame and get all that set in place.
You may be able to source these items from a Coach and Body Supplies.
Once it is working and you are happy with that, then remove the frame, set it on some sturdy stool etc and go to work making the rest to your design.
Make sure you disconnect the battery before welding.
Assuming you are going to polish the timber floor, you won't want to use it as a workhorse as the floor won't last long looking good.
Also using steel and timber as well as hydraulics, you will be adding weight, so the carrying capacity will be compromised.