Thoughts on how to fix a depression in the roof

Yup! That's the conclusion I came to with my car. Front of roof was pushed in by a previous accident that buckled the roof and support frame. Way to much time to repair so I bought and installed a complete roof from another car. Not nearly as difficult as it seems to do . Just measure carefully and take your time.

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Without seeing more, I'm not sure he needs to go that far. I'm thinkin just the outer roof skin.