Xiangqi set (Chinese Chess) box (2x4 x4)

Since the previous box (4x4 x2) doesn't print quite well on a ToM HBP, designing a smaller box seems a better use of time (than tinkering with curl issues).

This box holds 8 pieces per layer (2x4), stacked 4 pieces high. While still reaching the edge of the platform, the corners of the box stay well inside the evenly heated area and so shouldn't curl.

Since the box is smaller, the text on the lid now isn't surrounded by so much empty space.