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If - like me - you're not confident about this job then you might have to do what I've just done: Find a good welder/sheet metal worker and ask him to take a look. Most components of the birdcage will be available from aftermarket suppliers or junkyards so you just need someone who can visualise how to stitch them into your existing birdcage.
Edit: You might have to take the body off the chassis first. You'll definitely need to take the windscreen out. You might need to remove the front clip from the firewall too.