In any case, see that the vehicle/smallcraft rules seem to blurr at some point. The fighter epicted in IE (page 80) should clearly be a vehicle, and be treated as such, as it is under 20 dton, his drives must be vehicular grav plates (as the MD are only allowed for 20 dton or larger crafts) and its laser may not be a starship one (as the fighter has a 186 Mw rated PP, while a space rated laser needs 250).
Even so, tarings are given as if it was a small craft (even its laser battery, that, according to One Small Step, in HT and Challenge, should be rated as X), and I guess it's thought to fight with space combat rules.
I guess it's a broken design (as too many in MT).