dmbarbee

I am using x15 and have drawn a soffit that covers the entire kitchen ceiling. I wanted to add a ventilation register on the soffit, but was not able to place it when I tried. The register placed on a regular wall, but not on the soffit. 

Is it possible to place items to soffits? 

I also attempted using the 3D Solid Tools feature, but I ran into the same problem, I was not able to place the vent. 

Attached are two images, one of my design, and the other is the inspiration.

In short, I am using x15 and I am trying to create a staircase that starts with a two winder landing, then up the stairs to another two winder landing. I am able to create the winders, but don't know how to make them connect and reach the next level. 

I am using x15 and successful created a rooftop terrace using the following video. However, I want to add a skylight that would provide a light from an inner room through the roof. Technically, I don't have a roof. Is there another way to get a window through the floor. If that makes sense.  

I am using version 15 of Chief Architect and making a building that requires a flat roof. On top of that roof, I want to do a rooftop deck. However my priority is the flat roof. Any advice on how to construct it?