Josef,
The R22 weighs in at approximately 3500 pounds. It has a shoal draft keel.  I 
sail on inland waters where wind shifts happen more frequently than I need to 
 make another drink. Not only wind shifts, but changes in wind speeds. It can 
 become a handful. My comment was directed at the height of the chair. My 
opinion  is that this is not a workable conversion. I see nothing but trouble 
with this.  If I'm wrong, I will apologize and eat crow.
 
Rummy