The table is actually much sturdier than I would have imagined. Obviously there is going to be a little wiggle without extensive drilling or support beams, but I sat on it and it held! Have fun. :)
Step 1: Materials
LEGOS - Lots and lots. I recommend two colors for the best designs. You will also need 8 connector rods and pieces that can take these connectors (third picture).
Wood - Any will do, I just had these two pieces lying around.
Step 2: Building the Legs
Repeat the steps above and make another with a mirrored 'L' shape to go on the other side. Keep the pattern the same if possible.
Repeat this entire step for each layer of shelves you plan on using.