This stand is made from plywood, it comes apart into 4 pieces to stow in a laptop bag. I think the pictures are self explanatory.
No dimensions are given here as you will have to measure your own machine to fit. Be sure to make the lip at the front a bit larger than I did to hold the laptop securely in place. The top edge of each piece is covered with a slice of rubber from a modelshop, I used Araldite 2-part contact adhesive to attach this, it hasn't worked all that well.
The holes are drilled for lightness and airflow, you could be clever with this in all sorts of ways but I wanted to finish quickly.
Making tips: cut the holes with a hole cutter(if you have one) not an auger bit as this will splinter the ply. Don't cut the holes too big or too near the edges as this will create weak points.
that's it really.
Step 1: Enhancements
Because of the slot- together construction it is not that easy to carry the whole thing around- I will soon be adding some kind of 'tusk' or pin to hold the pieces together. I suggest cutting the slots so that the pieces that span from the front to the back support the pieces that span across the width of the laptop. This way if you pick the whole thing up it stays together as long as you hold it by the sides, which feels most natural.