mate leave the sub frame on just drop it on the n/s un do the anti roll bar link n/s undo the steering colume off the rack [inside the car] then carry on as normal.Then when the box is ready to come out bar the sub frame down to make the gap bigger and move the box over this leaves plenty of room to change the clutch and flywheel. Done loads this way takes me 2-3 hours and no need to line the sub frame up when done.