BTW...if you build yourself a Frankenboat, it's absolutely incumbent upon YOU to know your mods and report them to the RC. Live with what you're dealt - you didn't have to change the boat.
I echo Jerome: Kudos to WindyHill for asking the questions.
FWIW, w.h.... take a harder knock than you think you should, 'cause it will quieten the whining. Somewhat.
Yup.
There are other rating systems like Texel that are measurement based. Then cross over to DPN using boats w/ matching measured rating. Finally, if folks in the open fleet aren't happy with the rating you worked up- Talk to them! I would rather race w/ folks glad to see me and my boat then have a killer rating that makes winning easy. Leave that BS to the leadboat crowd...