This will be moved to the Newmar sub-forum, and it’ll get more responses then. There will be people who will be able to provide links to the build sheets.
We customized our Dutch Star in this manner, then shopped that sale to the top “known good” Newmar dealers via email. Those are:
NIRVC (GA, TX)
Tom Lindstrom (CA)
CC, Paul, & puppy Leap (ACD)
'17 DSDP4018, Wrangler toad