Where can I find Morale information relating to common area available?
There is a bit in HG on page 24 about common area. It is left pretty open for the GM. There are a couple adventures where crew Fatigue is an issue. Last Flight of the Amaur for one. I am pretty sure there is another set of rules for it in another book as well. In Last Flight it does not mention the common areas though.
COMMON DECENCY
Designing a ship with less than the
recommended common area space is tempting,
especially when space is at a premium and
the designer wants to fit in as many options as
possible. However, ships that do not include a
recreational area for their crews to unwind often
pay the consequences. Crew fatigue can set in
for personnel who have been aboard ship too
long without a suitable place to relax other than
their staterooms. Initially this might be irritability
and a lack of cooperativeness but eventually
could affect efficiency and performance, resulting
in negative DMs on skill checks.