You’ll still have to make the jig. The Snapmarks just make it easier to reuse it.
I purposefilly didn’t make a jig for this, but definitely would have if I had the snapmarks. I suppose my point for this was that I didn’t need it to be perfect so eyeballing it worked just fine for this piece. I didn’t want to sacrifice any proof grade draft board, and I was just too lazy to cut out cardboard.