You're not alone in this desire. There are several great sites out there that go into quite a bit of detail about the homebuilt flight deck.
One of the "cliches" of this is
www.projectmagenta.comI'm tempted, but I know how I am, and I would go without food in order to work on that thing, so I'm skipping it.
However, I've got a spare closet that I've been eyeing lately, and I'm thinking of making something a little less grand.
Good luck and keep us posted!