looking good, same set up as me. I'm just starting on my cooling system so can't help with the question.
Could you post a picture showing the coolant pipe layout and what size bore and bends and where you sorced the straight stainless pipe etc
My thermohousing has the smaller pipe that bypasses the thermostat, broken off. Not sure it it will be possible to drill the remains out and push fit something else in. Failing that has anyone got a spare housing going?