Fabricated the attach angles from the stock piece of 6061. This would have been quite the chore without a drill press, band saw, belt sander and scotch-brite wheel on a bench grinder. Deburred the holes and smoothed all edges. Fit it up to the front spar and match drilled all 18 holes through the front spar and doubler plate. I am spending a lot of time studying and reading.... measure twice, cut once right! knock on wood....