The 2002 Windsor has a full steel cage shell, it is the same construction as the Dynasty on up. It is the last model year it has this type of construction, after that it was aluminum.
There are probably more supports spaced across the roof to tie the sides together. Don't know how you could tell where they are, you might check the other side to see what is holding it up, measure and check to see if they are spaced the same.
2002 Monaco Windsor 38 PKD Cummins ISC 250 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi