Thank youHi joshymay
That size sounds fine to me. When setting it up , make sure there is somewere your diamond can cool down at all times if it wants. Constant high temps can be detrimental to their health. Do a little research on " Diamond Python Syndrome " and that should explain why. Good luck.
Unfortunately I don't live in NSW but thank you for your replyIf you are in NSW then this document should provide you with the information on recommended enclosure sizes.