Bad Piggies Rise and Swine Bonus Level 2-VII (2-7) can be 3-starred using two contraptions. To grab the star box, use three suction cups to speed across the level. Grab the box as you pass by, then continue along upside-down until you pelican-dive into the finish line. To beat the clock, make your contraption a bit heavier, add springs to reach the low finish line, and a boxing glove facing upward to stop any momentum.
If you have a different strategy for completing this level feel free to leave a comment below.