The Studebaker National Museum is one of those places on my bucket list for a visit! In the meantime take a look at the their website and in particular the archive collection which you can find here
The Studebaker National Museum Archives contains the surviving corporate archives of the Studebaker Corporation, the Packard Motor Car Company and other South Bend area industries. The Archives contain over 70 tons of material that dates from the 1850s
The collection even includes build sheets.