[Suicide Junkie]

One BTG per ship/unit. Ship-size / Unit-size specific mounts. 0kT for the BTG, but, ludicrous costs (10,000 of each resource), and very high reduction rates (1% per 25kT, or fraction thereof, of the unit/ship's size).

Are you suggesting a 150Kt escort would get 6% off the cost, and pay $9400 for each BTG?

The mount idea above, and one per ship/base/unit, would balance the fighters out fairly, IMO.

I don't think you read that right...
EG:
BTG 1: gives BTG component for ships, and a mount for units: BTG internals - 2x hitpoints, affects non-weapon, non-armor components only.
There would be no BTG component available for units.