metal
Hi.
Since you are doing a restoration, this is a perfect time for you to begin learning to fabricate metal repair panels. You will be be doing more of as you get further along in the restoration. The more you do yourself will help bring the cost down and will give you a greater feeling of accomplishment than writing a check. Also, you won't be at the mercy of a so called "professional" body shop.
Of course you do need a place to work and an investment in tools, minimal to start with. A lot can be accomplished if you put you mind to it and jump in. Yes, you will make mistakes, but they can be fixed, and you will learn a lot of skills.
Good luck,
John