I’m constructing a quick mock-up in sketchup and I think they actually did use these blueprints to build what we see. If I move the camera right in front of the pilot I can make the fins and cockpit parts match up nicely. I’ll post a render soon to show it.
I’m willing to bet they built it from the cockpit back toward the fins, similar to the x wing builds for filming cockpit scenes. I’d love to see something surface!