I made the four angle pieces (two shown in the plans at the top left).
What I found confusing was the difference between what is shown in the
plans on the top left and what I had in hand in the picture on the top
right. Note the difference between the left two holes in F-804J (the
horizontal angle piece). What makes it worse is when this piece is cut
and drilled as per what is shown in the middle left picture, the holes
don't line up.
I ended up abandoning the two holes in the center section web and drilled those called out in the plans. Using the ones pre-drilled in the center section would have resulted in the holes in the angle being too close to the edge.
