can be done with fords etc
the zetec bottom end mates up onto the cvh head. block up the oil ways you dont need, helps to do a wee bit of welding and machining, then you have a stonking motor. did it to mine, 2L 16v zetec bottom end on a 1.6 8v cvh head
never herd of it done on a saxo with the 8v and 16v TU motors.
the ax boys fit the vtr bottom end onto the ax head but they are both 8v.