First design of a complete novice, MS Surface Pro holder

[dmehling]

I am a complete novice to 3-D printing, and this is my first project. My design is a holder/tray for a Microsoft Surface Pro 4. I have attached a very rough design that I created in Tinkercad. All of the dimensions are nowhere near correct, but this is intended only to demonstrate the actual shape of the holder, since there are so many different types out there. This is simply the base. I have yet to add in side supports. I will have supports on all four sides sides to hold the tablet securely to the tray. At this point, what I really need to know is what material I can use and what the minimum width and thickness should be of the eight "planks". I am wanting to make it as light as possible, yet strong enough to support my nearly 2 pound tablet and a couple of USB accessories that will be secured to the tray as well. I would prefer to use ABS or Nylon, but I have no clue if they are strong enough.