You can convert your mech into each crafting skill, only once, but there is nothing stopping you from converting all the mech you have now into engineering since you only converted into outfitting before, right?

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You say to Tathalus, "Have you ever tried to clean a troll den? The smell sticks around for years to come."
Liev says, "That is my cue to leave."

Thanks, I had forgotten how to do this.