Topic-update;

Today I found some time to tackle the frame-damage on the Dart. Just did the driver-side for now, as this side had the worst damage.

Started out by cleaning everything down to bare metal as best as possible, with the K-member still in place.
I dimpled the damaged areas of the frame a bit, layed down some welds are ground them down again. The metal of the frame felt really weak in the damaged areas.

Then I slit a piece of angled iron between the loosened rear K-member mount and frame, and welded that to the frame as much as I could.

Not pretty but I felt it was fairly effective.
I also welded a piece of angle iron between the shocktower and the inner fender. Will weld another piece tomorrow and maybe repair the pass.side frame aswell.