Yes shes at least 3-4 yo

Yeah I will put foam insulated foam into it. Thanks!

Because she is a feral cat I just recently adopted. She has always lived outside. She can come in whenever she wants. She has her little door inside my house. However, seems like she loves spending time outside at night, I just want her to have a little cozy home outside for when she wants to or even for other feral cats I just can't adopt.

Yes I will insulate it, even if it becomes bulky. Thank you!

Thank you, that's the kind of answer I was looking for!

I never said she wouldn't be inside? She comes inside whenever she wants. She like to spend time outside so I just wanna make her a little house for when she likes to sleep outside. She has spent all her life outside, I just recently adopted her. She has a little door where she can come in whenever she wants.