Rust much worse than I thought...Pics...Freaking out

Yeah, i'm freaking out. Just got my "rear" floorpans welded, I was feeling all giddy after putting new soundproofing in and putting my seat back, etc.

Tonight I'm fixing the battery tray/ clogged drain rust up in the corner of the passenger footwell. I decided to investigate the passenger front footwell...BAD IDEA!

The more I "investigated" the worse it got. See pics. My only consolation is that the main crossmember underneath looks healthy and that it should be relatively easy to weld new metal in again.

Looks like it had been leaking for A LONG TIME!!!.