Laptop desk from Camera Tripod. Works along side your bed, chair , whatever.
First, I found a nut that fits the camera tripod base. Then counter sunk, drilled into the other side of a piece of scrap so that it wouldn't pull through and had enough that the tripod screw could bite into it from bottom. I made the wood base smaller than the laptop to help in the cooling underneath. Carefully tighten the tripod base to the wood (hand tighten)