I printed out my Flight Test Handbook, AC 90-89A as well as AC20-139,
Commercial Assistance
(I am a professional builder and IA) and AC20-27E, Certification and
Operation of Amateur-Built Aircraft.  It is about 100 pages.  I put all that
and the FAA forms along with the EAA blurb on how to register your homebuilt
into a 1" binder for reference and to show the DAR at certification time.
Very handy reference material!
Walter Dodson  IV-P  now in flying WLS primer, 90%