I just spent an hour or so with all the pictures - in photoshop. I adjusted brightness and enlarged areas. I would love to see more photos of the tool box / rear deck area, please. Are the tabs for the earlier type of tool box welded in place? I notice the passenger floor is gone from one photo, but a foot rest and seat in another? Is the VIN plate in the engine bay gone? Looks like the car had air-conditioning. The rear-view mirror is not a red-dot.
This firewall photo bothers me the most. What is the marking around the serial number? The chassis is clearly a later design / type. I don't believe the metal pressings for the shapes in this chassis existed in 1969. If it were a "test mule", there would be evidence of welding from one chassis style to the later. For instance, the side vents in the rear quarter would normally have this cup welded inside. What about S30-00002? Dates on the wiring harnesses will provide more evidence. Long pig-tail fuse box, or short?
Thanks for sharing all this, Kats.