Phil,Thanks for asking. Long story short from experience, extreme aversion to unnecessary complications and my not-so-humble opinion:
Get the factory to install it all. (This is a high quality product and their assemblers are not schlock artists, so the work is as good or better than you and I can do.) Their interior paneling on mine was puncture-proof (with a hammer swung hard), resin-hardened OSB, which Lowe's and Home Depot do not have. Number each section for easy replacement. It's easy to take down and re-hang, as opposed to cutting other paneling to fit and then fastening it to the aluminum wall studs.
The extra you pay will save a massive amount of personal stress, slow-motion construction time and conundrums.

Best wishes to you,
Prem
My goal...
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...is to live in a trailer.