PIKO: Problems Assembling Faller's 110096's Shed Roof

A while ago I've ran into issues assembling the roof of the shed for the Faller 110096 Klingenberg station. I've emailed Faller support at the time, and they were very kind and provided by post - free of charge - a new paper mask and a few elements as well. However it was my fault that I didn't explain my problem very well. Hopefully I will be able to do this below.

At page 10 of the manual included with the station, the roof must be applied on top of the walls, after the M2 paper mask has been inserted in place. This doesn't work quite ok though. A bit of background: the roof has 2 shoulders underneath; these will "click" in place when applied to the walls of the building. Also, the adjoining wall of the station has 2 grooves, into which the edges of the roof will only slide into provided the shoulders click in place when applied to the shed's walls.The problems start when the shed's paper mask is put in place - once this is done there is no more room for the shoulders to be inserted so that they "click" in place between the shed's walls, since the paper mask takes up that space. Also the grooves in the station wall no longer match the edge of the shed's roof.

One way to solve this would be to cut the paper mask so that the shoulders reach enough depth, but this will mean the structure of the paper mask will be broken, thus losing strength. One workaround would be simply remove the black top of the paper mask, thus assuring the roof's shoulders are no longer blocked, however there is one problem by doing this - light will be installed inside the shed (Faller 180670); the shed's roof is plastic, but doesn't stop light completely, so will run the risk of the roof "glowing" in the night.