John,
As my esteemed colleague from across the pond has stated,
The only rules are;
A Tiger I
Only what's in the box. So if you get a kit with PE included, knock yourself out.
1/72
24 hours.
It would be great if you could take a pic of the box on your local newspaper on that day, or as some suggested, in front of the weather channel or something specific to your time zone/area.
Mainly it's just to see how wild and creative people can get in a short period for fun.
When it's closer to the date, I'll come up with a system so you can get me the pics and I can first post them anonymously so members can vote on certain categories.