solver

It depends on how accurately you wish to depict a cushion. 

You can create the shape with a Custom Countertop, and apply a molding to the edge to create a rounded profile. Follow up with an application of fabric.

256 sq ft down. Bit less up. Easy to build shed roof.

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I think I tried every room type but deck!

Good find Jo Ann.

I've tried multiple ways to fix without success. 

Including deleting most of the floor and redrawing. As soon as the rooms are back in place, the brick is back.

I'd send this to tech support. No matter how it got there, you should be able to reset the floor structure to the default.

You might want to tell us which rooms are wrong 

Your master bedroom has a 4" Red Brick floor, as does the master bath. Is this correct?

I reset the odd rooms to the default without issue.

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Change the Interior Wall Surface for the wall to be whatever color you want.

And yes, a custom backsplash would also work. Set it to 1/32" thick and choose the paint color as a material.

More details please. Could you post the plan file, or images of the room structure dialog?

4" is a standard concrete slab. Is this checked somewhere?

Still does not show for me.

You do have a railing that is causing the wall problem between the master tub and shower. Pull the 3 walls back and you wil be able to see and delete the railing.

Not there when I view the plan.

Can you select it? If so, it will show in the status bar what it is.

If this structure will be permitted, I would be discussing my ideas with the local code enforcement people. Finding out about stairs, room ceiling heights etc.

For showing the stairs in plan, and camera views, consider using a ladder. You will need to source one made in Sketchup, since bonus catalogs are not available for your version.

You have mentioned several times about wanting a well insulated structure, which prompted my suggestion of a foam outer layer. This is standard practice in many areas. 

You may google "balloon framing" and see images of how it's usually done.

I think you are over thinking/over engineering the structure. No need to reinvent standard practice.

Update us with your latest floor plan -- it's always interesting to see others ideas.

Why not build a second floor using standard wall framing?

Easy to place windows on any wall. Use all the floor space.

I've never understood the gambrel roof form on small spaces. 

Roofing is more expensive than siding.

2x6 floor joist need mid span support.

Balloon framed walls generally use a let in ledger to support the end of the joist, not sistered studs.

Wood is a poor insulator, and filling your wall cavities with additional wood will not help with insulation.

I'll suggest again a 2x4 wall with rigid foam on the exterior. This almost completely eliminates thermal bridging, and gives you a few more inches on the interior.

You could run XP in virtual mode -- essentially XP running within Windows 7,8 or 10.

You could dual boot. Have both operating systems installed and choose one at system startup.

http://www.amazon.com/Chief-Architect-Home-Designer-Download/dp/B0044DE8K2/ref=sr_1_26?ie=UTF8&qid=1439408455&sr=8-26&keywords=Chief+Architect

Why are you stuck on XP? Have you considered Windows 10? It's supposed to run on lower spec hardware better than 7 or 8.

View > Toolbars

or reinstall.

I'd be considering a single floor design as well. This one is 374 sq ft, and provides reasonably sized kitchen and bath. 

Back to 256 sq ft, but not 16x16. Minimal kitchen, but full bath down. Roof ridge could run either was as shown in the last image.

This type of question is often easily and quickly answered with a Google search.

Try "kitchen bartop overhang".

Here is the larger version, same lower floor, simpler roof. Needs full bath downstairs.

I did a bunch of roofs for this one, including what you suggested. I was going for the small house that had been added on to several times look.

At some point, it must make sense to do a full 2nd floor, or not?

This plan seems like you could live there full time, where the 16x16 plans seem like space for a weekend or week.

That makes sense. Roofs and walls are tied together in several ways.

Posting the xxx.plan file will help us help you. Make sure it's not open in Home Designer when you post.

This one is larger. Started out as a way of putting the stair outside the main area and evolved back to a square.

Plenty of room upstairs for a full bath.