Straightening Gunnel on Aluminum boat

[Mr1980]

Bought a aluminum boat that was sitting on its side along a garage. this is what i think has caused the gunnel to warp in the center ( turns slightly down ) what would be the best method of bending it back level?
My thoughts would to use a couple of pipe wrenches and and slowly pulling it back level. then using some clamps to pinch it back together along the starboard panels and replace some of the rivets where it needs.
any thoughts or anyone deal with a similar issue?

 

[Al U Minium]

I would trace out he good side and use it to build a form

Then do what makes it match the form

I like lots of clamps myself