Upper case plastic is bent, is there a solution? (photos included)

Yesterday I successfully replaced my hard drive with the great ifixit guide but there was 1 problem.

Before assembling it, I knew that the plastic was bent (a few months now).

When I assembled it, I found it difficult to remove the upper case because of the bend it had. I don't know how this happened but after I successfully replaced my new hard drive, the upper case didn't fit perfectly. And yes, I have screwed it successfully. It really has bended.

Maybe there's a way in fixing this?

I know this is a maybe impossible question but it's worth trying..

Also, I have accidentally screwed one nut in the dvi hole and I cannot get it out and I haven't got any nuts left :

Is there a way on removing the nut from the dvi hole?

Thank you for your time.

Luke from Greece