I think we just stick to our local clocks, beginning at 12:01 and ending at 11:59 on the decided date. I'll have a website set up and entrants can submit when finished, whenever finished, in their respective window. After the last is submitted, Japan and Austrailia I suspect, I'll compile the page for results. Of course progress in a thread would be fun as well, but nobody should be put out be having to submit to another's time zone. that's why the 24 hours and why we couldn't have a Zulu start time. Someone would be stuck building through the night.
I never got used to NFL football when I lived in Hawaii, A 1 o'clock NY start was aired before breakfast there. I didn't have TV(happy times) and you'd have to go out to catch it. No bars open at that hour which is a good thing. You'd go out to brunch and it would be well into the late games.
I was also thinking about the posting the submissions on the website anonymously at first so either we, or forum members, or sponsors can vote. If you post pics in the thread during the build this wouldn't be possible. If we did it ourselves and you agree not to vote for your own it would be neat to see who's the favorite build. Not best, just favorite.