Anyone have any ideas how to restore this???

Thanks for the pictures that looks great. What about re-attaching the panel to the door? The old panel has lost a couple of the clips.

Just post an ad on here for some clips. Show a picture if what clip you are looking for. That hardboard looks like the masonite when it is done. I think the masonite will out last the hardboard and either is cheap.

http://en.wikipedia.org/wiki/Hardboard

http://en.wikipedia.org/wiki/Masonite