A standout section includes winding your own pickups and creating active circuits.
It is unlikely you will find a single, official PDF titled available for free legal download. Martin Koch’s Building Electric Guitars is a copyrighted, commercially published book. martin koch building electric guitars pdf
The PDF is superior to the physical book for one reason: searchability. You can press Ctrl+F and type "ground wire" or "neck relief" and find exactly what you need in seconds. A standout section includes winding your own pickups