The drain can go to anyplace on the engine that's lower than the bottom of the cartridge.
This may include your pushrod compartment cover, timing cover, and (if you're using an electric pump) your fuel pump opening.
Farther down is better, so if it's not too much below the turbo make the line big.
I would attach a fitting permanently to the sheet metal with a 1/16" doubler (inside for appearance), like a bulkhead fitting with an O-ring, and a compression fitting or hose barb to accept the end of the drain hose so you can take it apart without getting everything wet.
