Saint had several cabinet plans included on the CD that sold with his book (BYOAC). They are also plans available here in the files section. What you need to consider when using these plans is to ensure that when cutting the wood for the front and back of your cabinet, that you take the width of your monitor into consideration when measuring the width of these panels. For example; if the plans say 30" wide and your monitor is 36" wide, you are going to need to cut them at about 38" or more inches to accomodate your particular monitor. Keep in mind that you will need room to affix mounting hardware around your monitor to keep it in place.
I have a 19" monitor with dreams of a 32" and have built my cabinet to allow for future upgrading of the monitor. Good luck-You are on the road to many years of tinkering.