Pretty sure Jimbibbly would do you lasercut shingle strips for the roof.

That said, I don't think that's how those tiles were made. I suspect that it was more likely done with strips of putty:
1) Roll a long narrow sausage of your preferred sculpting putty.
2) Wrap said sausage around the roof, along the very bottom.
3) With a sculpting tool, smooth the putty flat into a ribbon, and then score or "cut" gently into the face of the ribbon to get your tiles.
4) Allow to cure.
5) Repeat from step (1), but ensure that each putty sausage is laid higher up the roof than the last.
If you use something like Milliput, you can also carve or chip tiles as you like when they are all cured, or even file/sand them a bit if they are too irregular.
Beauty of doing it this way is that you get a robust roof exactly the way you want it, and with frankly minimal skill required. Cheapish too, depending on the putty you use.