For a starter frame, you may want to go with a simpler lug shape. I was advised to stay away from the fancy lug shapes for a while. I'm only on frame 7 so I hope somebody with more experience will chime in on this but a simple long point lug will be easier to braze and then clean up. It might be hard to flow the filler without overheating the smaller parts of those lugs. Until you learn to get clean shorelines with no globs or voids, you will not be happy with the results and clean up will leave you hating life.