Room with arched/curved walls and ceiling?

[joesausage]

I've scoured the internet and I can't really find an answer to this question.  

 

I'm attempting to re-create the space seen in these photos in Chief Architect (or Home Design, either one), but I'm really having trouble creating arched walls and an arched ceiling.  It's a very basic 10m x 2.75m room - except that the walls are curved, almost from the floor.  There's very little 90 degree wall to speak of. 

 

The curved ceiling function really isn't working for me - it's trying to create a barrel that runs like an arch the length of the room, not an arched ceiling with the arch spanning the width. 

 

Any suggestions here that aren't super duper hacky?  I'd like to be able to do things like place lights and furniture in the room as normal, so the idea of making it one big arched doorway or something isn't really gonna work.

[glennw]

 

Is this what you are after?

 

 

[CharlesVolz]

16 hours ago, glennw said:

 

Is this what you are after?

 

 

Roof or ceiling plane?