Maybe they could call a nice sunshiny day an F-1?

I doubt even your house would survive a direct hit from an F4 or F5. But I imagine the odds are extremely long it would get a direct hit from one that powerful, in WI.

(Amusing side note: last night the weathermen were so anxious to turn the storm into tornadoes, one declared the high winds downtown an "F0")

Is this like Dryvit?

Before I built my house I saw a pic of the aftermath of a tornado (your big bad wolf) that went through a neighborhood. There was one house still standing, and the rest were totally demolished. While it had some roof and siding damage, it was pretty much intact. You probably guessed it by now, it was an ICF house. That's not the reason for me choosing this construction, but it certainly didn't dissuade me. That neighborhood that was destroyed is only about 50 miles south of where I live, so a reasonable possibility of also getting hit.

I did a combo of both. I hired a contractor to do the majority of the house - but my son and I did the attached garage portion. We could have done the whole thing but would have been more time than I could devote to it. The 3 1/2 car (and extra deep) garage we did in one weekend of putting up the forms and another day to pour the concrete.

I built in the spring of 2006, which was after hurricane Katrina down south. Most of the wood building materials were going there, so were higher costs in WI. Overall, the ICF was about the same as 2x6 exterior wall stick frame construction at the time.

Benefits are that the foam itself has R22 insulation value, and the concrete is a huge heat sink - so takes a long time to heat up in the summer and retains heat quite well in the winter. And it's quiet!

Downside is that the walls are 10" thick, so your window boxes need to be extra deep (all the major manuf's offer this so not a problem). I also found that how the concrete gets poured (the amount of lift in each pour) matters a lot. My contractor probably had too much height per lift, which caused the bottom to bulge. So the window boxes extended different amounts from bottom to top (I ended up having to trim them by hand as I installed the trim, which was laborious).

In my area there were only 3 builders who were familiar with ICF - that was back in '06. I'd check your local area for builders and then go see their work. It can go more rapidly than stick framing, so when they say they're working, it won't be for long.

If you have the time and inclination, you can do it yourself. I'd spend some money to have an experienced contractor come check your work out before you pour - and maybe even do the pour itself as if you have a blowout (a weak spot that pulls apart and leaks cement) you need to have many hands that know what to do quickly.

I also installed steel trusses for the flooring on 1st and 2nd level which can be directly embedded into the concrete.

Hmmm, I guess you can call that 3D printing. As a mech eng, I'd like to see some structural data on the materials and how they hold up over time and as subjected to various environmental conditions.

I think that this type of application could be used for Insulated Concrete Forms construction. I used that in my latest house and the constraints are in what forms are available from the manufacturers, which are usually straight, 90 and 45 deg corners. This would allow the creation of forms that could take any shape. The other issue for ICF is the time of assembling. These sections could be created in much larger modules that would go together much faster. An interesting idea.