Quick update - was able to find a local shop that does a lot of vehicle fab (4x4 customization, overlander conversions on on old military vehicles) that is willing to partner with us on the roof raise.
https://www.rlcweldfab.com/
Never done a roof raise before, but seems like a very competent shop. Work starts in a few weeks.
What are the gotchas that an experienced fabrication shop should watch out for on their first roof raise?