Using a table saw, rip your 1/2” sheet of plywood down to 11” in length.
Take your 11” strip of plywood and cut (2) 8 1/2” sheets.
Use your router, set to 1/4” depth, cut out a space according to the dimensions on the picture.
Using your router set to the same depth, cut out a space on the upper board (this will be where the chalkboard resides) according to the dimensions on the picture.
Paint and/or Stain to your liking.
Attach Hinges so that when the "laptop" is open the hinges stop when the upper board is in the correct position for use.
Enjoy! Have fun in the car or at home!