The cage size your planning would be really good. Depending on your feeding methods, if you release food freely, make sure he has a strong hunt to him or feeders can roam without being consumed. If you cup or hand feed, you should be fine. Just make sure it is high enough off the ground so he can climb high and feel secure.
I'm currently building a cage roughly the same size for my male ambanja panther which prefers hand feeding, but hunts like a bull shark as well. Keep us posted on your design, as the community is always interested as to misting, lighting and water drainage ideas and designs.
Below is what I'm working on currently, roughly same size as yours, but I'll be removing the middle screen between to make it one enclosure.