Langston Fields

For Langston Fields you could use the Black Globe rules from the forthcoming
Power Projection: Fleet as the Black Globes are 'reverse engineered' from the
Langston Fields - and apparently Niven and Pournelle
knew this and though they would have a case for suing but were wise enough not
to.

Other than that how about extra rows of hull boxes and
once they fill you start rolling crits - one per row
and 1d6 hull damage per row. Maybe the ship just goes
'boom'.