This, exactly.
My AHR .404 rifle was a 2012 build by Wayne that started with an in-the-white CZ 550 Magnum action, honed, trued, and blueprinted.
Every component on the rifle after that was a custom addition.
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The only quibble I have with Bonk’s comment above is on relative pricing.
Assuming an original $6K or $7K custom 404 rifle built by a name ‘smith like Wayne, say, ten years ago, and assuming the rifle is still in excellent condition even if hunted, it’s probably closer to $10K today. …. Maybe especially if the seller could also furnish some amount of factory .404 ammo and reloading components (like bullets and brass) to sweeten the deal. In other words, a complete package.