Wings on a Mk II are welded on. If they're not straight, then I doubt the rest of the car has had the right care and attention.
I know plenty of rally drivers, and have seen them fixing bent cars - and they don't fling 'em together like piles of shit. I've seen a Chevette HSR look like scrap one week, and the next, it was good - and yes, the inner wings were very strongly patched and straightened, but the outer panels fit as well as my road-going Chevette at the time.
Mk IIs are common. Bits for Mk IIs are common. The only bit worth anything is the shell. If you can't be arsed to make it look almost good (not mint, not concourse, but at least straight), then you've thrown away the value in the car.
Richard