I tried to keep things simple as possible. I chose plans that were available for free online and modified them to fit the form factor I wanted.
I used tools I had available but these tools will vary depending on the plans you choose.
I used drills, a table saw, a chop saw, a pocket hole jig, a palm sander and a jigsaw.
Step 1: Planning
I decided that I wanted to mount a mini PC under the table. I chose the Asus Eee Box EB1021. It is small, it has built in wifi, it comes with USB 3.0 and has HDMI output. It also comes with a VESA mounting bracket which made my life a LOT easier when it came to final placement.
Find the plans for your table. There are plenty of free and paid plans online. I chose this set of plans: http://ana-white.com/2012/05/plans/itable
If you decide you want a bigger or smaller table adjust your plans accordingly. I chose to make my table 3’ x 4’ foot with 18” high legs.
Draw out your table using the measurements you have decided on. Make sure you clearly mark where you want your monitor to sit and where you want to mount the PC. It is a good idea to wait until you actually have the electronics in hand so you can get accurate measurements. I modified the size of my table just slightly to accommodate everything I wanted to do with it. The more time and thought you put into this part the better your finished product will be.