Hi lowboygmc . . .

I have not water cooled a turbo but have plumbed for intake heat:
Inliners post cira '13

I have plumbed from the back of the block - as you are planning:

But tapping into the thermostat housing will not get you any flow. You need to get to the input side of the pump:


This creates a peripheral circuit where coolant flows through the loop regardless of whether the thermostat is open - just like the heater core loop.

Also, since posting this originally - I have ditched all the brass and replaced it with galvanized steel. Apparently brass doesn't hold up to vibration and will eventually shatter where threaded :-(