Congratulations on getting a new snake, the enclosure looks nice
Not very large at all, I remember when I got my stimson python she was a month old and about the length of a pencil, his size will all depend on how large his food is and how often he is fed.
Do you have him in a click clack at the moment? I would suggest when you put him into the enclosure to put newspaper folded or something between the gaps in the glass.
