I started just cutting out the two basic roof panels out of 1mm foamed PVC sheet stock. I then cut out the sections where the half dormer style windows sit. I also cut the sides of the dormers, and managed to get a pretty good match to the angle of the roof.
The really difficult portion is mating the dormer roof to the regular roof. I have always had trouble figuring out how to cut that angle. It is definitely slowing things down at this point. You can check out my current process below.
|The two roof panels cut out|
|Roof sections marked for the dormer cutouts|
|Oops, had to modify the interior a bit to add some bracing to support the roof on the false front side. Had to trim away some wallpaper to provide a surface that would accept the plastic weld glue.|
|Braces in place|
|Test fitting the roof panels|
|Figuring out the correct angles for the dormer sides|
|Cutting out what will become my cutting template|
|Gluing the dormer sides in place|
|Test fitting the roofs again, looks pretty good.|
|And the other side. The next big challenge is figuring out how to making the sloping dormer roof which also lays tight against the slope of the main roof, tricky.|