Is the soil known in your area to move that much in a short time or was the cement done poorly?

“Because of this investment, more Alabamians can provide a better living for their families, and it helps cement Alabama as the preferred destination for the aerospace industry."

I had done big work and it only took that long when we need to wait for dry cement which won't be more than 2 to 3 weeks.I believe the delay could be because of a claim to the insurance, right?

Precast concrete is a low margin business overall but seeing as this is very special, it would be more that simple stock tanks and the like.I would go for in-ground all the way.

If you're thinking in the Reno Tahoe, NV area you can check out this rent map: https://www.addressincome.com/data-center/reno-rent-mapLook at other factors in the neighborhoods, like close to trails, restaurants, college, or a cement plant.

amp existing panel)- Fiberglass wood clad windows with screens, an exterior swing door and 4 panel sliding glass door, and standing seam roof and a skylight, 2 new - glass garage doors- James Hardie fibre cement board or similar siding- Built-in casework for storage- An allowance for kitchen appliances including combination range, hood, dishwasher, microwave, refrigerator, and washer/dryer- An allowance for mid-grade plumbing and lighting fixtures (Delta, Kohler, or equivalent)- Ikea cabinets or equivalent with solid surface countertops- Assume heat pump and ductless mini-split for heating and cooling- Assume solar system to be installed on the ADU per California Solar Mandate, including battery storageWith regard to the JADU, we're considering dropping this and simply expanding the house to the basement.

And overpour is when you get the truck to pour in the cement?

You hear the stories of cement in the toilets and holes in every wall simply because those are the outliers.  

If you pick a bad tenant in any state, it's going to be a pain to evict them and when you do, they can always put rocks down your toilet or cement.

I think these details definitely cement the viability of a fix-and-flip product - given your history / plan for the project, it could look like a 10% down situation if that's reasonable for you financially.