But if one sees it from the larger ecosystem for example, let's say Tesla , created demand for nickel in the nickel-producing country to build the battery.

My #1 property management customer are folks just like you - built a spec house, can't sell it, and want to make it an annual rental to stop the bleeding.

My AC guy showed me years ago to check the date the AC was built on the metal tag with the specs.

  $5 for batteries and whatever your time costs. 

If so, install a propane pig underground, and hook up a propane generator to it if your local regulations allow for it.If a propane truck can't get get to the site, there are several all-in-one battery solutions that have the battery and inverter and solar panels together. 

Write everything down.This is a Tile Spec - 1 page of 4 of a project I did, you can see the detail....it may seem like overkill to some, but there are good reasons to go into this kind of detail.

We are choosing new build because A) our family 4 has a certain size demand B)  the price-quality ratio doesn't seem to make sense when considering a preexisting home C) with interest rates being at near 8% with preexisting homes, builders are offering 5.99% interest rates and the exact home we are looking at is about $75K discounted because it's a spec home and the builder doesn't want to pay taxes on it.So, live in it for 5-6 years hopefully rent it out with a fully finished basement for potentially $4,200 in 5-6 years.

If you have internet connection onsite the meter has 5 year battery and you can read it remotely.The old versions basically had an outside meter in a lock box in parallel with the water line.  

Once you figure all that out, you'll be set.If you do not own your own house, go to your buddies house or a spec house for sale and get some measurements.From there you figure your standard size cabinet door.

I have already contacted a general contractor that says he will be able to build spec slab homes for sub 150$ per sqf.