Back from Jakarta and Bandung in Indonesia this morning after two weeks, I took my time unpacking and eventually decided to go out to the garage to get re-inspired. It didn't take long, I back drilled all the front spar holes to 5/32 (A5) after removing the nose ribs. I then marked and cut the rear spar angle to 45 degrees and then drilled the 38mm hole for the aileron push rod exit.
Measured and cut the 45 degree angle on the rear of the spar