This is probably a dumb question but I can't see an easy way to do this. I have fitted some bedroom furniture and I have wall cupboards either side of a chimney breast. I have a gap of around 50 mm between the chimney breast and the cupboard side. The chimney breast is only about 200 mm deep and the cupboard is 300 mm deep and I know I need to scribe the filler strip to get a good fit but I can't figure out the best way to do it seeing as the cupboard projects further out into the room than the chimney breast. I hope that makes some sense to someone who will come along with a perfectly simple way to finish this job.