We need to install some Jacklines for a passage we are doing down to Jervis Bay. Boat is a Northshore 27 (see pics below).
The front and rear horn cleats have decent backing plates as seen below. I was thinking of fixing the webbing jackline with some type of snap hook to the bow and stern horn cleats. Where would I get webbing the right length? what is the best combination of hook, shackles etc to secure to a horn cleat.
cheers

i prefer webbing as it doesn't roll when you step on it.

Go see you local sail maker, get them made about a foot shorter than the length from cleat to cleat with a loop either end.

Cow hitch through the front cleats then tension as required with a lashing of 4-6mm spectra at the rear cleats.

Make sure that you have a good pad eye at the front of the cockpit to clip on/off to as you enter/exit the cabin. Most offshore sailors these days have two tethers on their harness, one short and one long so that you are clipped on at all times on deck.

For the occasional use that I need them I have a couple of ropes 8mm I run from the bow bollard through the inside of the stays and tie off about 2m from the stern. I know people say about rolling on the rope but there are other ropes on the deck anyway . A lot cheaper.

And always have a knife or two on you. I carry a leatherman style, and a gill tool with webbing cutter.