If you wanted 1,000 I'm sure you could get them cheaper elsewhere, although I suspect PMW would be happy to do a deal with that sort of volume. If you just wanted one, I doubt you'd get it cheaper. One offs are invariably expensive, even when done by dedicated prototyping workshops.
Yes, I'm not sure where the tipping point would be either, but I suspect it'd be more than even the most industrious frame-builder would use in a reasonable time frame. I like the design but it strikes me as being quite a niche product.
If you wanted 1,000 I'm sure you could get them cheaper elsewhere, although I suspect PMW would be happy to do a deal with that sort of volume. If you just wanted one, I doubt you'd get it cheaper. One offs are invariably expensive, even when done by dedicated prototyping workshops.
And as t.b. says, it would be deeply unethical.