I have always went from the top down. There is just to much danger of things happen doing it from the bottom up or hollowing it all out then going back. I have seen demo's by Mike Mahoney, Larry Hasiak, and David Ellsworth. They all have said never hollow it all out and then go back to the top or even the middle. The first one I hollowed I did hollowed the whole thing then went back to thin the top and it wasn't pretty so never tried it again especially when I go thin. Just my $1.298 whatever that is worth.
Retirement: That’s when you return from work one day
and say, “Hi, Honey, I’m home – forever.”
To succeed in life, you need three things: a wishbone, a backbone and a funnybone.