I am glad to see there is some interest with this! Since this isn't a kind of GB that one can just join in midstream, we'd need a good number of entrants to begin with or I imagine it will fizzle out if goes over a whole year. I would think 15 or more as an ideal.
Or I am of the mind that if there are 10 or less participants, it would only run for 6 months.
My warning would be with a shortened timeframe, choose your kits for the vote very carefully.