My Bam has a hutch exactly like that at my mother’s, but it’s way too small for a bunny to actually live in (Bam is about 4 pounds). Since he is a very well-behaved boy he can be free roam at my mother’s so we never close the hutch door, but he does like to go there to sleep and eat hay etc. If you choose this hutch, you really should give your bun an extra space in front of it, like an exercise pen.
You can of course paint its outsides. I have painted the insides of my outdoors hutch (only used occasionally in the summers) with white oil paint, you know normal outdoors paint, glossy, 3 layers of paint, because that makes the hutch way easier to clean. But if your bunny is a chewer, it’s perhaps not optimal. Where I live outdoors hutches generally are painted on the insides because they’d rot otherways (moist climate), but of course you def have to make sure the paint is like 2-3 weeks dry before the bun can have access to it.