General rule is an enclosure of 18"x18"x30" (45x45x76 cm) for a baby/juvenile and then moved into a bigger cage of around 24"x24"x48" (60x60x120 cm) for an adult. These are the most common pre-made sizes used.
These sizings offer a more vertical style than what you have, but yours will suffice...
Looks good so far. A lot of horizontal branches is good to see. Maybe get a few vertical ones near the bottom so he can scale the planter and climb to the top.
Assuming the top of the big vine is his basking spot, that seems good, too.
As far as temps go, it is good to have a gradient in the...