You guys keep saying this as if increasing production was as simple as adding a second shift the the factory.
Some data from TRO :
Great Wyrm : (2844)
"The Great Wyrm performed even better than expected, and Mongoose scientists increased production to capacity; they churned out scores of the units to swell their own rank and hundreds more to trade with other clans..". The production stopped in 2869, so they produce hundreds or thousands of this mech in 25 years (almost 200 was still operational in the 3060's)
Ursus : Alshain captured in 3051, Bear's start the upgrade of the factory from IS light capability to Clan Heavy, it took 7 years. Late 3059 first Ursus production, end 3060 (grossly 1 year later) most of the planets on the boundary with the DC have at least 1 star of Ursus (+/- 50).
Nobodies said it was easy but it is fare from impossible, for the lack of ressources, manpower maybe but the raw materials ... common they have dozens of planets to exploit, moons, asteroid belt .. etc ;)