That hutch doesn’t seem too good for cold weather. Well done for the effort but I wouldn’t want your little bunny to die because of the cold temperatures outside. My grandad built my outdoor rabbit hutch with the scraps of spare wood that he had laying in his garden and in ours. These pictures a little bit messy because I use it as storage now because my new bunny is indoors (and will probably stay there). This hutch for me at least was 100% free because we had all the supplies (my grandad is a carpenter). It would be fairly cheap anyway. And I know my hutch isn’t very attractive to the eye but it’s quite easy to do (it took him 2 weeks, working about an hour and a half each day) and you can just paint it with pet safe paint on the outside.