I don't get why you would do this in a world where prototyping is so extremely cheap. Even if you have no hardware, you can easily get e.g. a resin 3D printed m

I don't get why you would do this in a world where prototyping is so extremely cheap. Even if you have no hardware, you can easily get e.g. a resin 3D printed model made for very little money, just as a sanity check. See if it mechanically fits, alignment looks right, etc.