NANUK935 Waterproof Carry-On Hard Case with Lid Organizer and Foam Insert w/Wheels- Graphite

Do they make a trekpak for this case?

As a "first-timer" I'm wondering, how does the cubed foam work, do I need to cut it out to fit my equipment?

Crush resistant? Can an average sized adult sit on the case when it's laying down, on top of the lid, and not have the lid collapse, sink, or bow?

Where is the case made?