The open geometry has the same problem that the chains had — areas which should be cut higher than others and which aren’t separated — this gets into a traditional art problem known as “figure-ground reversal” as has been discussed previously:
At a minimum it is necessary to section up the closed geometry and join it with the open geometry which forms the balance of the perimeter.
As before, we select the upper level geometry:
and move it to its own layer for later reference and duplicate it in place:
and select the in-between geometry:
delete it:
and then draw in geometry to join together:
and repeat for the lower portion
Then select the overlapping geometry:
and use Trim Vectors to remove what is not wanted:
until one arrives at:
OK
OK
Join Vectors
Repeat this until one has a continuous outline around the design elements in question.