Sure did mate, have a look on my web site,
there's a pic of the T bucket that I started to build way back in 2000, had to get rid of that one unfortunately. Have diff, engine,trans, for the new one so far. Have an option on a 23 tudor that's in a hedge, am...
You are right in your assumption, it is part of the coolant system for the oil. The other part of the system runs up the front of the LH bank to the thermostat area. All can be removed and blanked off.
Started this swap some 6 years ago, been making progress recently to try to get it finished and on the road. What makes this different is that I have installed a BMW diff unit to give the car a sensible final drive ratio to stop the loss of traction when the std diff is used.