Serious Body Rust Below Driver's Side

Anybody have creative ideas on how to fix this piece? The support piece that runs side to side looks like it can be cleaned up and rustoleum'd but the perpendicular piece is absolute swiss cheese. I'm getting antsy about ordering floors but I can't do anything until this gets solved.

From the perspective of the driver - or the driver's feet I guess. Bottom of the photo is the piece that runs side to side under the front bench. The piece in the middle is what I'm trying to repair/replace.
View attachment 1715711420

Pedals for reference.
View attachment 1715711422
Check out this guy's Youtube channel. He'll give you plenty of ideas on how to fix that.
https://youtube.com/channel/UC6JPmJ_aicru8XPWr3EvJnw