From what I can tell, it looks like the front firewall panel and floor panels appear to be the only for sure need to be replaced. They appear to be riveted so really just a matter of drilling all of those out.
Far as the square tube up front, DF can supply you that piece, I know this... However, welding a new one in would require pulling your hoses back out which I image would not be a ton of fun. I have AN lines ran thru my frame so can't provide much input on the default hoses.
But if you end up welding the new tube in I may be able to give some tips on getting that done. Otherwise, that kink in the tube may not be particularly problematic assuming it hasn't pulled the coolant line tubes inward.