Thanks for the replies.

I was thinking of bolting a new tang to the floor so that I could coat everything with POR. If I weld, then I can only treat after welding. Welder says he has a product that is not affected by welding, but don't know what it is. Maybe just rust converter?

I see same problem with repairing door sill to floor. I would have liked to coat as much of the inside of the rocker panels that I can, but again welding prevents that. I guess only thing to do is spray Rust treatment (Like Krown or Rustcheck) inside the rockers once the welding is complete.

I had another offer for the car as-is ($1500), but decided I am far enough into this, I better get it completed!

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5