Here's a post that might help - https://www.wikihow.com/Make-a-Guinea-Pig-Cage
Hi! Maybe this will help
We have 6 guinea pigs (our Petsmart gave us a boy and girl, when it should have been 2 boys!) and we landed up with 4 babies... We have a cage for 6, but this site also does cages for 2: https://www.guineapigcagesstore.com/deluxe-guinea-pig-cages
This post gives you lots of options for making guinea pig cages.