I ended up with an RB components storage box that I wont be able to use with my build out. Here is a link:
https://rbcomponents.com/collections...x-deep-76-sofa
Box is 3-sided. 76" long 13.5" high and 22" deep. It is meant to go around the wheel well and create a storage space and platform for an RB components sofa or bench. It's in like new shape and breaks down flat for shipping.
Let me know if anyone is interested.
$300
Retails for $545.99