Traders and Gunboats is a GDW product, not a "referee ruling".
Beyond that it's just common sense, if a fitment exists in another rules book, supplement, adventure, or JTAS article, it is reasonable to assume it could be used in any design LBB 2 or LBB5. Unless it's specifically prohibited.
Beyond that it's just common sense, if a fitment exists in another rules book, supplement, adventure, or JTAS article, it is reasonable to assume it could be used in any design LBB 2 or LBB5. Unless it's specifically prohibited.
Sure, the Referee or "super-referee" can rule anything they want, but I, as a lowly ship designer, can't.
LBB2 has no concept of a fuel purifier, just "drives are specially built to use [unrefined fuel]". Sure, LBB2 doesn't ban fuel purifiers, just as it does not warp drives, but that does not mean that either is free for use or without cost.