How do i build a c and c cage?

Guinea pigs shouldn't really permanently live outside. Neither should rabbits, especially not in the winter. Guinea pigs and rabbits like the same temperature as humans so it's better to keep them indoors. Don't use sawdust for guinea pigs - use wood shavings. Sawdust can get into their lungs. I think the cage will be fine if you use those panels though. Good luck :)