If you are interested in my Catalina plans and retracts you should check out my
FLICKR site - http://www.flickr.com/photos/sturla/
Catalina Plans $95 plust P&H - plans are shipped in a tube
Main Landing Gear/Retracts $995 + P&H
Nose Landing Gear/Retracts $395 + P&H
The plane has 2x Quadra 35 engines but I think you could also use Zenoha 22 engines
Mike, Iborrowed some old plans of the actual Catalina from an old flight mechanic and used them to create the retracts.
My Catalina plans have details of the retracts.
Sturla
http://www.wix.com/Sturla/PBY-Catalina