Looks pretty similar to mine. I always use the plastic blade clevis, makes it easy to change blades, in fact I store most without a blade and clip one on when I use it, less tangles. They only cost a few cents more than the metal clevis and IMHO wear the line less. I have made some with 2 clevis and use a drop line with a walking sinker to get depth, or attach a sinker direct to the harness.
I've always used mono. I think 20 lb test (would need to check), might be heavier. I have a spool just for harness tying. I've tried Fireline also FWIW - not really impressed.
I have some I purchased years ago in Ontario that were wire, they were good in pike territory, worked good enough to hook a 30" walleye in shallow clear water.