My character cedaria just reached level 20 last night. She's now 12 rogue, 8 arti. My goal with her was to slaughter everything with her repeating x-bow, shouting "Say hello to my little friend!", as she does it. Let's face it, a repeater is basically a machine gun when under the effect of endless fusillade. So she's a drow with mech 2 and be 1. At level 20 I took her 8th level of arti and took construct essence. I know, probably not the most popular of choices, but have you seen the master ring of artifice? Automatically casts reconstruct on my toon as she takes damage, with a reconstruct clickie spell I can use at any time...

My add powered rambling aside, I discovered that my mechanic rot, (repair over time), rogue mechanic spell doesn't work on my toon, despite her construct essenceification. I found that to be annoying.

The point of this, if there even is one... is that I think that the rogue mechanic repair spell should work on artis that have construct essence.