ᐅ Detached garage: earth-covered and accessible on foot

Hello,
we are building our single-family house on a south-facing slope. We have about 1.5 ha (3.7 acres) of land to manage, mostly for commercial purposes (tourism).
Therefore, I plan to buy a small tractor that will be used for mowing in summer and can be fitted with a backhoe bucket. In winter, the vehicle will serve as a snow blower.
I want the tractor to be protected from the weather, so I am considering having a prefabricated double garage installed into the hillside, where the tractor and tools would be stored.
The garage would be completely covered with earth on the west side, as well as at the back and on top. The garage is positioned on the property so that we would step out from the balcony into the garden and basically step directly onto the lawn above the garage.
Does this approach seem feasible to the forum? Who has experience with this?
Best regards

Just so we don’t get the wrong idea: should the tractor be imagined in the size of a quad bike / ride-on lawn mower, so still clearly suitable for standard car garage dimensions?

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So, when I look at my neighbors’ prefabricated garages and compare that to my L-shaped concrete blocks having to actually support the load, I wonder how that’s supposed to work? I think you have to (or it is recommended to) even upgrade the roof in Zapf if you live in a snowy area, and that’s only a few kilos of water. Funny idea.

We also wanted to build a structure next to the neighbor’s prefabricated garage... but we were not allowed to, max 20cm (8 inches), otherwise it would no longer be stable according to the structural engineer.

Everything works, but I don't think this is possible with a prefabricated garage. For this, I would recommend waterproof concrete double walls and a waterproof concrete ceiling. However, this will be considerably more expensive than a prefabricated garage. It’s best to find a manufacturer of concrete double walls near you and inquire there!

I also think that the usual material thicknesses for a prefabricated garage won’t be sufficient. It will need to be built as a solid structure with the appropriate structural engineering and a thick reinforced concrete ceiling. Starting at around 30,000 euros.