Are there likely to be any issues with arranging a short 45 deg. fall in the toilet waste pipe?
The current plan is a vertical outfall terminated at a manifold above the soffit. There is insufficient space to get this high enough to accept a full *horizontal* run. Probably 2m level, 45 deg. bend, 800mm and another 45 deg. to the manifold.
I will arrange a vented (AAV) stack inboard to be higher than the basin overflow.