Blackberries: be fruitful and multiply

I finally finished the trellises for the blackberries, other than a few steel posts I need to add. I still have to tie up the thornless vines, as they are starting to get long enough. Only time will tell whether the posts remain sufficiently tight under the weight of the berries, particularly the thornless, which are entirely non supporting. If that happens, I may have to add a brace or a deadman.  I'm including links to two videos I created of the process.  BEFORE and AFTER.

Before: tangled mess

After