I built this kit not long ago. I did a five window roof. I didn't find the roof fitment to be too bad, but it does take some work. I did glue one side and then the other. I didn't use any reinforcements inside, and that would have made it easier. I did have a glued side come apart on me that probably would not have happened if reinforced. Be careful where you locate the reinforcements, they are in quite visie locations. Good luck, its a fun kit once the roof is glued.