the original fluff, notably that the dracs took quinetin right as the world had geared up to start building them, which was in 3039 so realisticly a early 40s deployment time seemed to make more sense.
It's worse than that, they have Griffins being produced by 2 factions from factories that changed hands in the 4th SW. (Oliver & Marduk)
Because ssuuuree, the designs were on the drawing board 20 years before they were produced & only a couple years into decoding the Helm Core, LOL.
A lot of folks complain that 3047 is too early & should be 3051 or something, but I'm fine w/ 3047, that said, the whole "captured factories bit never made any sense at all".
If they had said something like, the engineers worked together across border lines I'd have found it more realistic than 3029 factories having plans for a design that won't get produced till 3049.