You don't really need a full blown outdoor enclosure for a one month old. I'd work on that sort of thing over winter to be ready in spring when the weather warms back up. Then your baby will have gained some size and mass. For now, you just need some sort of temporary enclosure like a kiddie pool with some substrate thrown in it and some deep shade. There are many ways to do it, but a little baby should not be outside too much, so I wouldn't spend a lot of time or effort on it just yet.I'm in process of building him outdoor enclosure.