There isn't a recipe you can follow to do it, because there are many, many different ways of making a custom case. Any kind of building or sculpting skill you already have could theoretically be used to make a case.
You need to be sure to leave adequate ventilation, but other than that, it's pretty much wide open.
If you don't feel skilled enough to make a case from scratch, you can customize an existing case by using special parts like lighted fans, LED strips, etc.
The OfficeMax Corner Computer Desk is easy and light weight too
I would definitely purchase a computer desk with an easy to assemble hutch, as they are generally cheaply priced. http://www.amazon.com/Computer-Desks-Hutches/b?ie=UTF8&node=1069106
GALANT Corner desk is easy to assemble.
A computer work station for home use should be simple, lightweight, easy to assemble, and affordable. A home computer desk usually has basic features such as a slideout for a keyboard and a bottom section to hold a desktop computer.
Please assemble the desk as quickly as possible.
It can take anywhere from thirty minutes to one hour to assemble an office desk.
Many of the desks available by mailorder are quite easy to assemble. However, it depends entirely on the type of desk and the company you order it from.
Sauder computer desks come in many sizes and styles. They look great in a home office, and are affordable. They are easy to assemble with clearly labeled parts and instructions.
Assembly Instructions, Marin Wine & Storage Cabinet Tobacco
It is not to hard it comes with instructions.
You can find ready to assemble office furniture at Staples, Target, or WalMart. There are also nicer computer desks available at Crate & Barrel, Thomasville, or any other furniture store.
A computer lap desk is normally used for a laptop. A regular desk has traditionally been used more often for a desktop. Therefore it depends on your computer.