Pixel XL Remixed case

Remix of kamma_cz's Pixel XL case to make a thicker back.

1) My edits were crude, while kamma_cz's original case is smooth and refined.

2) Near the charging port, I've noticed it's a bit uncomfortably sharp. I sanded down the uncomfortable area.

3) I used 80% infill but I don't know if infill even mattered.