"Give it your best shot and then grit your teeth when after glassing the bottom, you find that maybe you've lost a bit of rocker from the glass tightening up during cure. -- John , dose that mean that if you glassed the deck first it would increase the rocker when the glass cures.?"
Yes. I've had it happen (the altered rocker) but it depends on stringers, etc. It's usually no big deal - just thought I'd mention it if he was pulling out a micrometer.