Does anyone know what type of foundation/construction this might be?
Prefer not to tear down more to see what's underneath...

It looks like it's built with:
Styrofoam (at least a knife blade thick)
Sheet metal
Treated stud
Stud and further up with a 95mm stud frame filled with Styrofoam.

Concrete foundation with visible insulation layers, including foam and metal sheet, covered in white polystyrene balls and wood paneling above.
 
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