Hi all thanks for the comments, - verrrrry interesting -
The mast-step IS already about 8ft further aft... Any further adds complications for the aft stays... It should be almost achievable without winches, (on a 12m stick with single set of diamonds), as the sails, (40 to 45 square metres each), are to be light weight cruise material, furled/fully reefed before wind-speed over the deck exceeds 20knots... Then motor... She surfs very nicely with autopilot on the rudders and fine tuned using the throttles but left alone on a dead downwind run she did very nicely surfing the waves at 19.5knots and the engines at 3000rpm (usual still water speed of about 7knots) with NO DRAMAS...
I do not really want to sell but as Troy suggested, I too found several things I wanted to change within minutes of launch... She still is a very nice boat and has achieved nearly everything I required... except to convince spouse to join me as crew.... Her won't is stronger than my will... and whilst moving (sail or motors) I am happy, but I need to sleep sometimes and there are several legs requiring overnight runs as well as 450 miles Cairns, Queensland to Samarai, PNG...
The mast, sails, RO watermaker, battery charger from Christie engineering, new 3 blade 15 x 11.5 propellers, and about 1 day on the hard stand require an additional Au$45,000 or so to implement...
This is the one on the short list
http://www.thecoastalpassage.com/cheapcat.html as a motor-boat, so I can muck around on Moreton Bay with occasional ventures up to the Great Sandy Strait behind Fraser Island... - - if I do not do another 39C