[FT]SML question

A quick question regarding SML`s. I want to use a SML with limited arcs
(or
more limited than present), and was wondering if mass 2 for a 2 arc
lancher,
and mass 1 for a 1 arc launcher sounds reasonable? (at normal x3 cost).

Also, in a campain, how would you people work the building rule to
prevent
pure fighter forces (ie-fighters used as offence, with the carriers
withdrawing and picking up new fighters at cheaper cost than a
starship?),
or using "stingboats/LAC`s" with FTL tugs (which for the same mass are
cheaper than a normal FTL warship, if the tug withdraws/is reuseable?).

BIF

"Yorkshire born, yorkshire bred,
strong in arms, thick in head"