Check out the examples section on this page, a lot of them give step-by-step detail on how they were built/restored. Check out Lusids plans also as a lot of cabinets seem to be based on this design. Control panels are pretty easy if you can do the woodworking bit. Interfacing to the computer is made even easier with a keypad encoder such as an I-PAC. again, have a look around the examples and you should get a better idea at how to go about things.
I'm currently building my first cabinet also, so welcome fellow noob!