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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.
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If the cuts are most visible from the inside then it will be tricky to do a good cut with any power tool once the carcasse has been assembled and there is more of a chance of a cock up occuring if you make the cuts before assembly (it can be done though).
Jigsaw wise you could use a push blade and cut from the side that needs a neat edge, giving the edge of the cut a light sand with ~ 120 grit sandpaper. You could also try a laminate blade (very fine bi-directional cutting) in my experience you need to control the speed VERY carefully with these.
To be honest in this situation my preference for doing this or any other cutting where it needs to be a good, clean cut for example scribed decor panels would be a really sharp fine toothed handsaw. However your sawing technique needs to be good - keep your wrist, elbow and shoulder in line
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@iamalex
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.
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