Suggestion for LNOE/IFOS crossover needed

[jlafan2001]

I tried out a scenario last month that involved 12 people playing 16 heroes and 56 zombies. It was slow at times but once they all learned the rules, things sped up a bit. The downside was that we were playing the "Hunker Down" scenario and the players found that they couldn't accomplish the objective because they ended up just surviving. We needed to either bring the zombie count down by half or cut the zombie card hand by half. All in all, everyone had a blast and would be willing to do it again.

I was thinking of having an "Earth Over run" scenario with the Martians involved too. This time there maybe 14 players. I would like to have all 16 heroes again and I would like suggestions on how many zombie/martian players to have, how many zombies/martians should each player have in their pool and how many cards in their hand.

Eg. 8 players with 2 heroes each (total 16), 3 martian players with 9 each (total 27) and 3 zombie players with 7 each (total 21). The zombies would have two cards in hand while the martian players would have three and draw one at a time.

Does this seem balanced?