Yes
No its not, i guinea pigs cage is way bigger. & you should not have the same size of guinea pig cage as your hampster.
no
Yes, definately.
There are six guinea pigs in the cage now, including the mother and her five babies.
I would not recommend it. Just have the Mother Guinea Pig in with her babies separately. Sometimes the other guinea pigs can get excited and accidentally stomp the babies to death so best to keep Mom & babies separate.
it depends if you want more babies then after the babies are cleaned off put the boy back in otherwise your boy has to go in a different cage
you shoudl not put a hamster and a guinea pig in the same cage no matter what.
Yes, i bought one Guinea pig and added another around the same time, and they get along great.
you could put another guinea pig or they would probably get alond with hamsters or bunnies
don't keep them in the same cage if they have not been spayed or neutered unless you want babies.
This is not really a custom cage, but a cage with homemade penthouse on the top. http://www.guinea-pig-paradise.com/homemade-guinea-pig-cages.html
It depends. They certainly wont be aggresive, but if you do, make sure to spay and nueter them.