All looks solid from the back, the outside vertical steel is fine but the inside vertical steel is holed and the horizontal piece is completely rotten. A couple of closer photos that show it better.

I bought this 1985 90 a couple of months ago, in the knowledge it needed a few jobs doing. There was a fist sized hole rusted through the driver's footwell, which I've repaired - see photo. I got £500 knocked off the purchase price for this, now I know how much work is involved fixing it, I...