Heh Jim at IL-RC...thx for the response pertaining to your Century Jet installation...Copy on the surgery from the TOP of the wing. What I see is the GREAT necessity due to some "rice and balsa" factory construction is to replace the ribs adjacent to the main gear "bay" and (as per prior thread recommendations>>smart way..) use ply ribs/ and beef up the floor of the bay. Accomodating for appropriate height of the retract mechanism req's trial to ratchet up the height of the base as needed. >>>>How does one work inside that wing??? ....I saw substantial need to cut away to gain access.... Any Sierra retract experience input. I've FINALLY got four vacation days to work on this---gonna hit it like a Roger Clemens fastball, if I can ..open ears and open mind-----I'm listening. YesI have the scizzors installed by Sierra---gorgious work.