Good stuff! It looks like you're on the right track. Coincidentally, my '79 was also born with manual windows (I have the build sheet) and had power windows added later with factory parts. I contemplated (and still ultimately may) switching it back. I've got no issues with swinging a crank and kind of enjoy it as an old school throwback in my '71 GT-37, even though that has 4 cranks including the rear quarter windows.
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'09 Magnetic Gray Metallic G8 GT
'79 T/A Solar Gold Metallic W72/WS6
'71 GT-37 
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