@Roland-Wijnen JLCPCB.com seems pretty happy with the files. Its rendering of the completed pcb looks correct, and they'll ship me 5 copies of the board for less than $10 US, including the shipping price. Seems like a plenty cheap price.
I haven't made this board with them, but I've used them plenty of times in the past, and when they render a board correctly on the portal, it always comes out correct when I get it in my hands. (Well, other than design mistakes - they make it just how I design it, but that's a different story.)
