Rory,
I don't have any experience with a R22 on a lift, but it sounds like a  great 
idea for keeping the bottom clean. That being said, as my boat sits in the  
water, the bow is heavy and the stern is higher. All water that collects on the 
 seats drains through the centerboard pennant hose. I make sure that the ball 
on  the end of the pennant line does not block the hole. My boat also is 
slightly  heavy toward the starboard side, so water collects in the seat gutter 
and turns  green over a period of time. I have found that sailing on a regular 
basis and  spilling as much rum as possible on the starboard seat keeps the 
green growth in  check.
I'm not sure how you would seal the lazzerette cover. Gallons in the  
lazzerette is not a good thing. Perhaps the easiest solution would be to install  a 
bilge pump with a foot valve.
 
Rummy



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