[tinkthank]

Ehm, I still havent found that darn thread, so I can't tell you, Cohen, whether it was pre- or post-2.12. I can't really remember the details, and I'm afraid I never bother with numbers or formulae, it was a purely empirical test. IIRC, it was in a province with Steel Ovens (I think -- in any case, a prov with a construction bonus), FotA was up, and the forger in question had a dwarven hammer (or MAYBE it was hammer of the forge lord, but I doubt it), and I was forging my favorite item (Rainbow Armor !!! Yum!!!) for free, or zero gem cost. I don't know any other details and never bothered with the math. I only know that it was the case. I detailed in that thread how to reproduce the situation, and I am sure that anyone can test it. Currently, I do not have the time, but I am sure you can just whip up a map, Cohen, with say #knownfeatures steel ovens and put FotA up and test it.
Best to you

PS. butch AND platonic? Yikes!