This was made for a very loved tortoise but could be adapted for guinea pigs with wire or a cover over the top to keep out predators. For me, it would just be an outdoor playtime cage only with supervision.
A tiger mother lost her cubs from premature labor. Shortly after she became depressed, her health declined. So they wrapped up piglets in tiger cloth & gave them to the tiger. The tiger now loves these pigs & treats them like her babies. This is so sweet.