Meh, looks fine to me.
People WAY overthink the "integrity" thing. Just look at all the hacked up melon field buses, or the peanut farm buses. That bus pictured looks AWESOME!
I did this roof raise, and sold the bus as pictured. It then went from Apopka Fl to Del Rio TX with no issues other than the new owner was a bit chilly.
Some folks are afraid to take out the interior sheet metal skins because they think its ALL structural and crucial. This bus sorta disproves all that, imo. NO flexing or ill effects from the removal of all that.