I've made OK progress with this... so thank you.
I cut at 45 degrees with the mitre saw, getting the profile I need, then I cut at 0 degrees (or is it 90 degrees?) twice to 1) get a bit of the waste out and 2) to cut up from the bottom to the first 'hump', then I used that FatMax saw to cut the other bigger bits away... at the end I used a multi-tool with a spinning sander part to make it look better (as I've not got good control of this coping saw yet and it's a bit finicky)... results are... well, they're average, but they are scribed and that's what counts... plus acrylic sealant will come to my aid I guess.
And lots of paint.
I cut at 45 degrees with the mitre saw, getting the profile I need, then I cut at 0 degrees (or is it 90 degrees?) twice to 1) get a bit of the waste out and 2) to cut up from the bottom to the first 'hump', then I used that FatMax saw to cut the other bigger bits away... at the end I used a multi-tool with a spinning sander part to make it look better (as I've not got good control of this coping saw yet and it's a bit finicky)... results are... well, they're average, but they are scribed and that's what counts... plus acrylic sealant will come to my aid I guess.
And lots of paint.