Hood Bow help

[revjames]

So I am down to the hood. I have been putting it off because of the bow. You can not hardly see it in the picture but there is a dent/bow of about 1/8-1/4".

Two questions
First, how can you get this bow out, a buddy suggested body foam but I don't like that idea. I hesitate to use a hammer because of the size. can you body fill an area that big, I feel like that would be alot?

Second question? How would you go about getting an accurate arc the front half is straight but since it arcs I am having a hard time using a level, ruler etc.. I though about a bending ruler and suggestions Thanks?