Jase,
I would suggest using the WSOP structure as a starting point -
http://worldseriesofpoker.com/structures/MainEvent/Event10.html - obviously with a shorter clock.
Do you have any chips that you don't normally use, to use as 5's?
BTW, I think you'll find that 7-card Stud should be a Limit game... I seem to remember your schedule had it listed as either PL or NL.
Cheers,
Alan