All parts are designed to be printed in the orientation that the files are created. So the body parts all print flat side down. The angles of the 'bumps and dents' are designed to print smoothly and then a small bridge will complete the top.
I adhere to a standard where no part will have more than a 60 degree angle, which most printers can handle without issue.
Don't hesitate to PM me if you need more details or if you run into any problems.