A D20 is a 20-sided die often used in role playing games like D&D. Geometrically, it is an icosahedron, consisting of 20 triangular sides.
It may seem that sticking server computer components inside is completely random and unnecessary, but this was in fact a machine which we would hook to the LAN and run games (like Team Fortress 2) and apps like Teamspeak and a live video stream. Computer components generate heat which can be a challenge for adhesives, and everything would need to remain structurally sound for at least the 4 day duration of the summer LAN. As it turned out, it held up for weeks.
Here's a look at the finished product:
Step 1: Planning
The nice thing about an icosahedron is that it's just a series of triangles, which are easy to build and are naturally a sturdy shape. Once we had an idea of the interior space we needed, we figured out the length of the leg of any triangle and got started.