Have you made many pickups to back up your facts on materials and winding techniques? I don't find it difficult to wind consistent coils with hand feed and simple clamp tensioner. I got the impression that David has made quite a number of pickups and judging by the look of his coils his coils were fine. I guess the perfboard pickup you're referring is his multicoil prototype from -80 or so. That's the only perfboard pickup I remember he showed.