Since I use a cape-poncho/tarp, adding and removing guylines all the time could be a big time sink. I made evert pockets at the corners and sides that also work as reinforcements. Imagine a corner reinforcement shaped like a square, stitched completely around the sides. To store the guylines, just push the reinforcement inside out with the guyline inside. Velcro keeps it closed.
Evert line pockets keep guylines out of the way until needed, then they are instantly available, not tangled.