Don,
having previously designed for properties using SIPs, I have to say that I'm a great SIPs fan.
And, I do like your design. With a
little development these could have legs (sell like hot cakes!). Remember Henry Ford?
Budget homes for all climates - cold
or hot. They could be mass produced and used anywhere from Alaska to the Sahara!
Ikea made a fortune with flat-packs, now is the time for curve-packs, delivered to your door and assembled in minutes/hours.
And Darrel is correct, it's f, f, f, f, freezing here in the UK. Perhaps the cold has got to me?
Have an ice day, in your Igloo.

Regards Tim
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You can design without engineering, but you cannot engineer without design.
Using Win 10 with Designer 2016/2017 and TurboCAD Pro. Plat. 2018/2019 + Lightworks (64-bit versions) + AnimationLab 5.2.
Windows 10 Pro 1903 (Build 18362.476) 64-bit