EAA Books
I bought several of the well know builders manuals off the EAA website and Amazon including The Standard Aircraft Handbook, Sheet Metal Building Basics and all 4 of Tony Bingelis's books. They have proven to be very educational and a great reference.
11/18/19 Addendum, The Standard Aircraft Handbook was included with the tail kit. Now I've got 2 copies. That would have been nice to know prior to buying the first copy!