Bath waste run - slight rise or thru floor?

[MoDo]

Hopefully the pictures should do most of the explaining here. It's a corner 'freestanding' style bath so no removable panels. Instructions show flexi waste through the floor. However our 1st fix for this room assumed a regular panel bath so the waste pipe for the bath has been installed alongside the bath rather than under the floor. Should I change this whilst I still can or will this (slight rise over lip of bath frame) likely be fine? Although photos show a short flexi adaptor (Flexcon6 I think), will have to use a longer one (Flexcon2?) as there isn't enough 'flex' to get your hands in to tighten the fittings with the bath at a suitable angle with this one. Can't see a way to avoid a flexi in this case either way, I guess same as a regular freestanding bath.

 

Room - general view

 

Slight rise as waste exits from under bath

 

Flexible fitting

 

Ceiling below (proposed thru floor to follow orange line