Very cool find!
I'd be super curious to find out how much of it they built. I think they used at least a portion of the blueprints to build the fins behind the cockpit.
(from production showing the set before the bluescreen was replaced)
looking at the blueprints the fins look a lot wider than they do in the image above but that could be a perspective distortion... I might have to build a mockup to see.
(just to be pedantic, I'm not sure there was a forced perspective in the TIE cockpit.. that set is fully 8-feet wide I think, they built it to the specs printed in the Rinzler book. Though you only really see the back wall of it there are extant behind the scenes photos of the full cockpit... it's frankly huge.)