Another problem you may encounter due to sectioning the roof is the bows
being to short when it comes to installing a headliner.
Not trying to rain on your parade here.
I have done glass and upholstery work for many years
and so many times I have seen body shops create expensive problems
for guys like myself to overcome when their chop job was done.
Plan ahead now beyond the paint as for how all the glass and upholstery will go in.
Keeping these areas simple will allow you to do the work yourself and save
yourself a lot of money.