First off, I do like the idea. I've always loved more tech-heavy, end-gamish stuff!
But I have two concerns.
#1 why? What do you need to mass produce so much of? Practically everything in game, can be mass produced in huge quantities with a single skilled dwarf, and if you need more, adding 2-3 dwarves solves it. 15+5 legendary crafters turn out so many items a season it's absurd already, same for smiths and similar. Making it even more easy to mass produce, makes little sense as it has no practical use/need (in my view that is).
#2 Balance. if it could be made so the mass produced items had NO quality modifiers - this would be much fairer. Quantity over quality. But from your wording, it would effect quality too based on skill of the operator, meaning you could mass produce masterwork weapons, armor, crafts, furniture, etc etc etc, which further hits the problem of the game being too easy to do this already.
Needing machine-power (dfhack addition) might add balance to the concept, but I'm still against it simply because at this time, it's not needed, and would simply make the game even easier to an extreme degree.
Though, if you decided to truly commit to this idea, and make anything it can 'speed up' be produced a good deal slower by other shops, so it's balanced around eventually getting this building system, it would be fine. But you've not said you want to go to such extremes, so I don't assume that.