You can use a scroll saw, hand, or power. By hand, you have more control, but it is time-consuming. Power scroll saw works fine, using the correct blade.
This is the saw I use.
BUT.... for these small precise types of cuts, my preference is using Japanese hand saws. The first two saws in the photo (top-down), are flexible by design. The saw at the bottom of the photo is a Dovetail saw, which, unlike the first two, has a reinforcing backbone, which you can see opposite the cutting edge. This gives it rigidity ensuring it cuts straight. Also, the teeth are much smaller, with VERY little
KERF, which results in a very thin and precise cut. This is the saw I use for these types of cuts. I used the saw for the vertical cut outside the line of course and finished it with a sanding stick and small file. As for the bottom, horizontal cut, I don't use a saw at all, but drill small holes, proudly along the line and then like the others finish with the same sanding sticks and files.
I got mine at Woodcraft, as I find the quality and selection of the tools they offer make me

. You can find their selection in the link below. They are not expensive at all, for what you're getting. They all produce a wonderfully clean, smooth cut.
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