Ah, yes. If you're accustomed to Minor bodywork, this should be a breeze! My friend does Minors and, if he's not careful, they can gain on him... rusting faster at one end than he can weld at the other!
Don't bin the 145 tailgate too hastily. Although its rusty at the bottom, that should be easy enough to repair and the more complex shape around the window, where they often rust, looks good on yours.
Rear arches are normal; they almost always need to be repalced. Repair panels availably at Brookhouse Volvo.
John
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