GuruBrew made an excellent tutorial video with step-by-step instructions on how to design and CNC cut wooden enclosure for your 3d printer. Video is very detailed and will guide you trough the entire process with valuable tips & tricks, software and tools used.
This is what the enclosure looks like:
The enclosure is made out of .25 an .5 inch MDF wood and acrylic (plexiglass) plastic. It was cut ona Techno CNC router. It is designed in Solid Works and CAM software was VCarve Pro and Mach3. It was made for Maker Farm Prusa i3, but the design could fit or be addapted to most machines.
Here is the video tutorial:
Here is a video of finishing the enclosure with Plexiglas panel windows:
GuruBrew has a great YouTube channel with many useful videos I'm subscribed to and would recommend you to follow him also ...
For other similar DIY wood enclosure projects check this post which features enclosure heated by scraped hair dryer heater:
This style would go great with wood frame 3d printer, which I like since wood has natural and warm feeling.