ANC
Well-Known Member
Chopped the waste pipe and put the new fitting in at 53cm high as per datasheet.
I could only find one speedfit elbow at the hardware shop so I did a soldered elbow to compression fitting to move the other side, both can now be placed 7cm higher than the waste and 6cm from the center.
Still have to do the bath's plumbing and outer frame wall before I will mix up some concrete to fill the holes. and keep everything in place... I did make a little faceplate with holes drilled at the right places to keep everything where it should be while it sets.