Well that was certainly an entertaining read. And it always fun to make up your own classes. I like the idea, personally I've always liked a mechanic styled class in any RPG.

The only two things I'd say would end up being downright annoying for the player, is having to farm extra gear for your automatons, and relying on RNG for a support/healer.

I'd say the automaton parts should come from quests so they don't pollute drops for other classes, and don't slow you, gearing yourself, down.

The RNG support/healer thing, though I imagine some hilarious situations (hilarious for me anyways), would just frustrate the player I think. And that's mostly because you'd be picked absolutely last for a healing role. So it needs to bring more to the table to make it worthwhile. Personally I'd make it a support damage dealer with buffs and heals for your allies, debuffs and damage on your foes. If you roll a buff on a foe, its a dud and debuffs on allies are also a dud. You pick your target roll the dice and hope for something helpful, without being in too important of a role in the group that could make or break your encounter with RNG. That way it may not always work, you're still playing with chance, but you aren't overly punished at the same time.

P.S. Gadgeteer limit break "Flip the table" Raise everyone in a 6y radius around you and deal high damage to your target. :P