I removed the aluminum stiffener/skid plate and backed the car out a bit so I could pressure wash the oil and other various fluids off the spot I was working. Now I can get a good look from the underside.
I'm hoping it's only that I failed to tighten the coolant temp switch past the finger tight I remember.
It is possible that's where the leak is coming from and would follow the head to block parting line over to the exhaust side and down from there. Hopefully if that's the case I can get a wrench on it without taking off the intake again.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,