Do you use air in your garage? Air lines are always a nice addition to a garage. Rated PVC above ceiling in case they need service.
Any attic space makes the hatch a necessity. For storing the things you listed if nothing else. Drop down ladder just makes it easier to get there so why not?
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PVC pipe is unsafe for compressed air. When it fails you get many small and jagged pieces flying about at high velocity, I've seen where those penetrated through insulation and aluminum siding.