Louvered Window and Repair Bodywork

I decided to tackle the louvered window. I bought a second-hand window on EBay and thought I should look into how much rust might be hiding under the rubber seal of the louvered window.

	Here's the window as it was.
	So I'm suspecting there's a bit of rust hiding under that rubber.
	..but Jesus I wasn't expecting this !!!
	I like a project but this is ridiculous. Basically the whole of the lower window sill is rotten and will need extensive repair work.
	It's all like this. I'm going to cut out all the bad bits and weld some patches in.
	And more..
	The correct original window seal (I'd already bought the wrong one from JK).