"Unfortunately if you want to build something that is heavy/pile of poo it does, like you siad, cost as much as a low end suppressor from a manf."
I adamantly disagree with this statement. I have a pair of Form 1 suppressors that started life as tube/cap combinations 2 years ago. Yes, they are heavier than the lightest factory units but comparable to the mid level factory units AND the DIY units can be effective, quiet, and economical(approx $50 each).