This is a good thread beyond pointing fingers. It reaffirms that no matter WHO your builder is sometimes 'parts go bad', Fel Pro gasket is one example here. We've seen reports of parts failures of varying degrees to just about every manufacturer out there. The second thing is, right or wrong, the owner/installer has to do his part when it comes to maintenance.
If your builder is 'just down the road' (Boghosian who built Jamo's motor as an example) you stay in close touch and don't mess with "his" engine.
If your at a distance, as most of us are, the ball is in our court. Stay close to your installer/mechanic or do the service yourself, but you GOT to stay on top of it. Perhaps document the mileage, date and service done to 'CYA'. Get back to the builder in a timely fashion is there if a problem. No matter who built it...