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Long time no post, my friend!
The first step would be to contact the die and reamer makers to see if they have your "wildcat" in stock. Simple neckup/neckdown projects like yours have almost always been done already. So that will save you the time and expense of having engineering drawings made, and then having reamers and dies cut from those.
In the unlikely event that nobody has already done your project, you'd need to work with the reamer maker first. With a reamer, you'd have a barrel chambered.
Then, by using one or more existing dies, you could work a few samples of brass into a fireable shape. Send the fireformed cases to the custom die makers, and you're finally done.
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