I do as well, and would like to have the extra space and security over the OEM basket.
At the 2025 Ralley I spoke to the Seabiscuit Team and suggested that they consider an enhancement for the Olivers. My suggestion was to increase the box depth (Fore and Aft) to include jack inside. That would gain about 5" of additional space less the volume of the jack.
My only problem, and reason for not following your lead is that without massive solar and a nuclear power plant (600+ amp Litho's), I have to carry a gas can. Not good in a sealed box with stuff that could spark a leak. For safety reasons I would not be safe carrying one in my TV bed (with a sealed cover), in the cab of our TV,or on the back of Ollie. With your set-up would it be realistic to mount a 2 gallon fuel in front of your box in mini basked with a stone guard?
Another mod could be to address the gas can issue dirctly. Since gas fumes are heavier than air, maybe having a wire mesh for part of the bottom of the box to keep the box fume level below the lower explosive limit should there be a gas can leak.
What do you think?
GJ