I really like the Bridge City Kerf-Master jig, but have been wanting to build an open-grid top table for solar panel assembly with 2x lumber, which is beyond the capabilities of the KM-1.
I've worked up a one-piece jig that's only suitable for use with the blade you use to make it, but that doesn't bother me much. It should work for anything from coffee stirrers to whatever your saw can handle.
No measurements are needed to make the jig, and only one measurement is needed (to locate either edge of the joint) during use.
During use, you'll need a small scrap of the stock that's to fit into the part you're cutting. In the drawing, I've labeled it "Crosspiece Sample".
I'll leave the graphic on my web site for a week for criticism and comment, and then either discard it or replace it with a web page with larger graphics if feedback indicates I should.
You can see the drawings at: