What books have you found most useful for building, outfitting, and testing an
all aluminum homebuilt?

The Tony Bingelis books (available from EAA) are standards for all
homebuilts. Then there's CAM 18, an FAA publication (almost certainly
under a new name), and if you're building an RV, Van's has some good
summary instructions.

Other sources: take a class in aluminum construction, such as a
Sportaire workshop; and make friends with the locals in the EAA,
including the Tech Counselors and Flight Advisors. Also make friends
with your local A&Ps, or AIs.

Enjoy!

Ed Wischmeyer