Arsenal Bird, for those who don't know, is a boss-fight from the Ace Combat series, a Superweapon that looks like a dumb flying wing that can't muster a thrust factor of more than 3 with those huge electric props, until you realize that that wing is actually 37 hexes wide, and over 4 deep. And it's got 80 slots for drone fighters, and is itself an AI controlled drone. The more advanced model,
Justice, mounted point defense pulse lasers and a giant ship-destroying laser(Capital weapon, or sub-capital?), while the older
Liberty 'only' had a large batter of air-to-air missiles, bombardment missiles, and a microwave-powered force-field. Both were capable of limited self-repair, as after damaging their engines, they would restart after some time.
So, swapping a blue-shield system for the forcefield, how would you model these behemoth aircraft in Battletech? Their size alone means that a Mobile Structure is appropriate, but they're
aircraft and are as big as mid-size Warships. Would you force a piloting roll for every tiny hit on such a behemoth? How far do the rules need to bend to fit in a giant who would barely fit on a normal sized mapsheet?