[Will N]

I'm assuming you mean the engineering drawings/blueprints? I know that the Benson Ford Research center at the Henry Form Museum in Dearborn has the original Model A engineering drawings available. I don't know if they have the Model T drawings. If they do, it's kind of a PITA to access them. You have to be there in person and submit a request for the specific drawing you are interested in and pay for each viewing. Funny thing is that the Model A drawings were found by someone in a Ford office building garbage dumpster, and they were pulled out and saved. This guy later donated them to the Benson research center, and now they treat them like they are the friggin Dead Sea Scrolls!