[Slick]

The numbers are already in the FAQ:

6.4.5 Each crew quarter’s component counts as 16 defense against Boarding Parties.
6.4.6 Each boarding party is worth 25% guys if used as a defender.

...

6.4.9 Boarding Party 1, 2, 3, 4, 5 = 20, 40, 60, 80, 100 guys respectively. Security Station 1, 2, 3, 4, 5 = 60, 100, 140, 180, 220 turrets respectively. Any BP or SS takes up 20kt space. Boarding is successful if the boarding parties are greater than the effective number of defenders (Security Stations turrets + 25% of boarding parties on the defending ship used as defenders + 16 for every undestroyed Crew Quarters)

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The MC counts as zero defense against boarding.

Slick.