I'm glad Mrs Jif doesn't put her oar in like this. It has been very frustrating!
I solved all the ("remaining", surely?) original and the "traced by lines" clues and placed their entries in the grid, then traced the lines for the first two tranches of clues.
After that I hit a brick wall.
I can't see how to trace 'ONE straight line' through the 34 cells when there are 'two extra letters' punctuating the three entries. That must need THREE straight lines, surely?
Worst of all is painting/highlight two WHOLE columns to show THREE original words whilst also respecting bars.
I've left it very late to seek enlightenment. Hats off to those who seem to have grasped the right end of the stick/ruler!