Walter's observations that builder's and factory's manufacturing variances may have a significant impact on structural integrity (at least I think that is what he was saying) are certainly correct. It is unlikely that the average builder would achieve a structure that was stronger than the one the factory used for qualification testing.

Walter is also doing a service in pointing out, as I myself have done in the past, that it should be assumed that I am an idiot. I make no claims to accuracy or correctness. The reader is responsible for verifying any information presented.

To answer some of your questions, I have built two Lycoming powered LIV-Ps. I designed the Lycoming engine installation. Both planes won outstanding workmanship awards at OSH and both are still flying (~1600 TT between them). I have considerable experience in many methods of composite construction. My IV-P is one of the lightest (2,188 empty) and fastest IV-Ps and has 820 hours on the original engine.  You are correct that I have never met Mr. Doodly Squat. I would agree with your assertion that  communicating ideas does not increase knowledge but I would add that discussing ideas does tend to improve insight.

I have no intent to exasperate Walter but he must realize that arguing with an engineer is like mud wrestling with a pig. After a time you come to realize it the pig likes it. It is my nature.

Regards
Brent Regan