Anyway, perhaps you will take a brake from building, attempt to sell
it , then keep plugging at a slower pace for another decade or so.
Then you'll have to find a new hobby. Something really interesting and
challenging. Any ideas?

And maybe Corky will kick himself for selling the thing. Maybe
he could take a break of at least six months, then hang a Lycoming on
it, get the fabric on it and go fly. The V6 can wait 'til later or
could be sold. I've sold stuff (airplanes, boats, cars and machine
tools) that I later wish I had found some way of keeping.
Of course, I don't know the full story here, and maybe he's
been wishing for a long time that he was clear of it or perhaps there
are other pressures beyond his control. I do know that these things can
consume a good part of a man's life, and often it's just not worth it.
I remember one airplane at Arlington years ago; the placard on it that
gave the model, builder's name and performance data had, on the
cost-to-build line, some dollar figure and "my family" beside it. Wife
took the kids and left because he gave them too little time.
Your stuff can own you.

Dan