From a fellow Bay Area native to another, thanks for the blueprints and the inspiration!
I followed your blueprints for the carcasses, but made slight adjustments to the drawers themselves.
I also wrapped the carcasses with some subwoofer carpeting.
Lastly, I chose to not build the cover for the wheel wells and instead, used a couple eye/hook turnbuckles to secure the boxes to the front anchor points.
They're not perfect, but they're good enough for my first DIY woodworking project. Thanks again!