I bent the HS-810 and HS-814 angles in a vice by sandwiching them between two pieces of square mahogany. I routed a 1/8" radius on the edge of the wood that the angles were bent over to help achieve the radius indicated in the plans and used a cardboard template to check the bend angle as recommended.
I then marked and drilled the #30 relief hole on the forward spar and expanded it to 1/4" with a unibit. I achieved the 5/16" deep notch called for by the instructions, but I noticed that I did not have the edge distance typically required by the MIL-SPEC for one of the rivet holes in each of the doublers. I emailed Vans to get their thoughts and they replied: "This is one location in the aircraft where we have a known short edge distance on a rivet. This rivet was added due to the SB linked below. Your photo looks correct and no corrective action is required. Keep building." So it looks like I did it the right way.