quote dude234:

I don’t think it is a good idea to cut the whole section out. It seems to me you will loose support in that area if you remove that section.

If you’re not squeamish about cutting you can put in an aluminum "Nascar" type rad and never worry about overheating. And if it somehow gets damaged you can buy another for $170.
But you will need to use electric fans.
Did this about 15 years ago and apparently the structure hasn’t been compromised enough to cause problems.