-
I did a similar thing when I built some bookcases for the top of the stairs.
I used https://www.screwfix.com/p/trend-s-dar-200-digital-angle-measurer/1192k to measure the angles on each side (don't assume they will be the same) and my trusty Titan (now McAllister) track saw to cut them. The thing about the track is that it gives you a very neat edge by preventing breakout.A little finessing with hand plane and a detail sander and it fit snugly.
I need to chop up a wall of tall Ikea Metod units to fit the apex ceiling, similar to what we’ve done in the photo. I had family help doing then bulk of the kitchen but lockdown means flying solo on the last wall. Most of the cuts will only be visible inside the units with one cut outward facing. Would rather they were all as neat as possible though. I feel the finish can be improved over some in the pic.
Is there a hand saw blade most suited to this or for the borrowed jigsaw?
The Metabo above?
For the most visible cut I haven’t decided if it’ll be straight mitre cut or variable to get it a bit closer to the apex profile like the cooker hood.