I used inkscape for everything. I find that granular process explanation of mechanics is a bit less useful because everyone has a particular workflow or set of tools. If I describe it in detail some people will know what I mean and think it makes perfect sense and lots more will either be like “what?” Or “oh that’s a dumb way to do it”.
Ultimately it’s all just pretty simple path and node manipulation. it goes like this:
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Draw a rectangle the size of your test cut.
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Convert to a path. Add nodes to the vertical sides.
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Draw a curve that looks pleasing to you along the middle joining your two nodes. This will be your butt joint line.
-Now break your rectangle at those middle nodes and turn it into two “U” shapes, one up and one down.
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Copy and paste the entire thing so you have two working copies.
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Delete the top half of the rectangle from one copy, delete the bottom half from the other.
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Join the butt curve to the remaining halves and now you have your two shapes. Kerf adjust and go.
So there you go, my relatively simple process. Hopefully you find it useful.