Best bet for most parts is to find a good wrecker as they are usually much, much cheaper than EBay especialy for some of the iinterior parts than are non GTS specific. Or a swap meet. I just got a Right hand upper door hinge for $5 at a swap met. I have seen them go for up to $80 on Ebay.

Don't waste money on side panels for the windows. Just have each one welded in

With the Centre console, don't forget you can paint it easily enough