Use 10 packs of 12 and draft until the whole cube has been assigned.
After the draft, each player gets a land pack that includes
2 Fetches
12 Islands
1 Utopia Emblem: this card reads: Players begin the game with this emblem in play. Islands you control have ": add one mana of any color".
Players make 40(ish) card decks, and play a best-of-3 match
The best way to playtest drafting is to do a standard draft with 5 seats, 12 card packs, and 2 players. CubeCobra doesn't support Rochester drafting (get off my lawn), so this is the closest approximation.