I decided at first not to print the bottom, and stand the Vault Case up to allow for an open exhaust. After putting it together, it seems like most exhaust will come out the port openings such as the Hdmi port if I put the back cover on. I am now printing the back cover to further protect the Raspberry Pi and to check for any heat differences. I love this case, and with the work put into it, the only thing I would have liked to see was an exhaust grill on 1 side of the vault, even if it's just an optional print. Reduced my temps from 58-66C to 39-42C.
Reduced my temps from 58-66C with a spike of 84C, to 39-42C.