Garybills

They will need to be connected all the way around and then uncheck no room definition in the wall specification. I was curious so I used invisible walls and connected them, then unchecked no room definition on all the attic walls. It's not perfect but gets you a floor up there.

Try selecting the room and raise the ceiling height by 4 inches.
 

Here is an example I did, sorry I couldn't make a video showing how so I hope this helps.
You need this wall to be Gable to get rid of the hip roof you have.

Delete this roof plane.
 

 
Edit the main roof plane.

Are you looking for something like this?

I don't know what version of HD you have, but some of your textures were missing when I downloaded your plan and the missing textures said HD Suite 2020. My example is HD Pro 2020 so I hope Suite will work the same. Since you started you plan on an angle your floors aren't drawing on that angle. In Plan view go to Edit, Edit Area, Edit Area (All Floors), Marquee select everything then go to transform replicate objects and rotate -15 degrees. I hope this works for you.
 

Can't really tell from the picture, but is the area under the stairs marked open below?

In the layout view go to tools, toolbars, Customize Toolbars, search for page then drag the 2 arrows and change layout page onto you tool bar.

The wall type definition . controls the settings your needing, see below.
 
 
 
The foam seal is in the foundation setting, options. It shows as 1/2" in the material list and I don't see a way to change it.
 
I hope this helps.

It may be on the CAD default layer. Turn it off and see if that’s it.

in camera view, select the wall and grab the top middle handle and pull t down where you want. 
it.

In a 3d view, Select the Adjust Material definition (rainbow) tool, with that tool click on the stone and change the color of the Pattern to the color you want the stone to be and then in the texture tab select blend with texture. 
 

Check your temporary dimensions tool to make sure it’s turned on.