Damn.What ever you do,goodluck.
From my expirience with a friends collisioned stang,it can be fixed.First you need to bring 'er to a collision/autobody shop,and have them pull/straighten the frame out,then look for another rad craddle,have it spliced into the factory seemed locations that make up the inner fender to strut tower structure.That is just going by your pics.
My body's stang had the hole front inner structure repalced on his 5.0L,reason being it looked like a slinky.
.What the autobody shop did is what i already explained above,but more,they had to cut the inner structure out from the firewall forward from the frame rails at the factory seems,but living the strut towers in place as they were not effected from the crash,then continued to up in front of the strut towers where you'll see another factory seem,then spliced in the new inner structer by welding her up at all factory locations,and some.It was supper ridged,and straight.No one new,or believed it was in a accident.The reason he went this root is because the stang was paid for,and he lovedher,and in theory,made the front half a tad stiffer/stronger once all seems were welded in.Shouldn't cost much,depending where you live.It cost him 1600 bucks canadian for everything,parts,and laybour to fix.The extras on top were accessories like power steering,water pump,rad,and hoses,and fluids.
Like i said,good luck on what ever way you choose.