The 17mm plywood "X" legs can be modified and upgraded as you want. Here they are 730mm high. For the top I used 16mm chipboard, which is 2400mm long and 600mm wide.The span between the supports is 1700mm. I got my wood for 10 pounds from a timber recycling centre but it can be easily picked up for free.
No screws, no worries :)
Jigsaw or Hand Saw to cut the pieces
Jigsaw or Drill to make the holes in the plot surface
Better Jigsaw :)
Step 1: Cut Shapes and Holes
Cut the plot surface "X" holes using drill to make few holes and then shape them with the jigsaw. It's possible to entirely make the holes with the drill and then a rough file.