Sam Alcoff wrote:... There are large rocks embedded in the ground...
Windstorms and weather weirdness has increased in my region in the last 30 years. I fully support having the building fastened to something solid. The right tools can drill into many types of large rocks. You could then use small amounts of concrete to hold stainless threaded rod in place that can be used to firmly bolt your cabin down.
Ten by ten is small, but you will be much more comfortable if you can somehow harness the benefit of thermal mass inside insulation, even if that is just a small foundation of native rock. There's a tiny home build somewhere here on permies where that was done.
I'd look very hard at where the water is running and plan up front to make it go where you want it to go. I've used a native stone-filled gully beside a chicken coop to get it's roof water away from the driveway.
Thomas' done a better job here:
https://permies.com/t/275116/Leaning-tower-Pizza
There are lots of low-tech ideas out there. It's a matter of choosing the right one for your skill-set and your location.
Yes, you say there are no codes, but there's still the 'code of nature', so I recommend your loft has an operable window large enough for egress if shit happens.