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Bog standard circular saw, just cutting from both sides. Bit of careful measuring and you can get the cuts close enough.
The only thing that’s tripped me up (and has been the same throughout the build) is because my panels are 2nds, they’re not perfect and in some cases the 2 OSB sheets aren’t perfectly aligned, which has thrown my cuts out sometimes, if you were using brand new panels you wouldn’t have that problem.
Just this morning, I was talking to someone about my office build and saying that if I did it again, I would go SIPs, and gluelam beam for the front frame (as opposed to stud, OSB & PIR, and steel flitch.
How are you cutting the board & PIR core?