1. You could, but it would likely be very expensive. For example, I uploaded one of the hull pieces (there are 4 of them that make up the center part of the ship), and it was $38. He's split the files so there's a bunch of prints, but you don't detail while printing and assembly is relatively easy. That doesn't work well with Shapeway's pricing. It'd probably be a couple hundred dollars at least.
2. I'm not sure what all he did for those photos, he did mention primer. Likely he used a resin printer which typically leave very small print lines. He may have lightly sanded with a high grit (400+), but typically primer and paint hide most of the print artifacts
Your best bet would be to purchase the files for yourself and see if someone would be able to print them for you.