Tial has a T28 turbine housing that can work.. Worse case scenerio we can cut off the T28 plate and tig weld on a new one.
Also I use external Wastegates so EFR turbos have all that built in. As far as down pipe its fairly straight forward now building a new one wouldn't be much different if it had a V-Band instead of the 4 bolt flange it that I have now.