I've finished the fight now. Thanks Randomizer!!! I just stood in the center of the chamber, put my character and Yoshiria with ranged weapons and Yannick full of recovery potions, all with battle frenzy, and just kept pommeling ranged attacks on the active thinkermage construct. I took a beating from the turrets, and occasionally one of my characters got pulled near a construct, but it's done. Now I can say it was a sort of funny, different from the rest, fights.