Dovetail splines for a box
It's a common thing. Depending upon the length of the sliding dovetails,
you may want to taper them, makes it much easier to assemble.
Yes typical sliding dovetails benefit from or even require a taper in one component or the other. For splines not so much because you will get gaps. However, chamfering the end of the key (male) piece can help to get it started
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