Hi Daniel,
Great sketch.
Not sure about leaving your mount inside it , outside the house ,but can not see why the pier would not be as good as a standard movable HEQ pier.
The barrel and the mount would attract a lot of condensation , cupfulls over time, from warm moist air trapped inside and from the cooling of metal at night unless it were air sealed , thermally isolated with insulation and desiccant.
Would it be simpler to bolt a pier or base plate to the driveway with an alignment plate and carry the mount out?
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