Open Middle: Maximizing Rectangular Prism Surface Area

Creation of this resource was inspired by this Open Middle problem from Robert Kaplinsky.
[size=150]Source: [url=https://www.openmiddle.com/]Open Middle[/url] by [url=https://twitter.com/robertkaplinsky]Robert Kaplinsky[/url][/size]
Enter any digit ranging from 1 - 9 in the boxes below. Once all digits are filled, go explore!
What did you find for a maximum possible surface area? Show below. Also, explain your logic as to why you chose the digits you chose.
– Tim Brzezinski

Information: Open Middle: Maximizing Rectangular Prism Surface Area