|Assemble your supplies|
|Drill holes for the jig saw|
|Let the cat inspect your work|
|Use a jig saw to cut out the middle|
|Duct tape screen in place and staple|
|Add molding to front to hide ugly parts. Glue in place. Paint.|
Update: I just found this tutorial on how to add glass to kitchen cabinet doors. It would be helpful to also read that post if you are adding glass OR screen to your kitchen cabinets.