Kickflip Quake
Kickflip Quake is a very simple mod that takes in elements from the Tony Hawk's Pro Skater series. It was one of (if not the?) first major gameplay revamp mods available for Quake. That being said, there was only one minor change that needed to be done to accommodate its support in Interstice.
The player's skater, progs/skater.mdl, has an internal resolution of 1032x190. Being above 1024 can mean hardware with small hardware surface sizes can fail to load and subsequently render it's internal skin, leading to the common Quake skin "artifact":
Rather simply, the solution Interstice takes is to resample skins above 800px (number chosen to also optmize VRAM usage globally) to their POW 2 size divided by 2, meaning the width goes from 1032 pixels to 512 pixels.