Fixing to this high plasterboard wall

Fixing to this high plasterboard wall

Fixing to this high plasterboard wall

The walls hollow so I guess plasterboard. Can't find studs with magnets or stud finder but kitchen units are going up on it. What fixings? Gonna be heavy. Do the hooks go onto these plates in picture?

For loft can I cram down the insulation and cut osb to GP on top? What's all covered

TACH]

by Keitai

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