Began fabricating the auxiliary and lower longerons. This was fairly simple, although the joggle in one of the 713 auxiliary longerons was horrific so I opted to take page out of the RV6 build plans and attach the aft end of the longeron with an attach strip angle and a spacer. This ended up being very strong and working out well although it took more time than I wanted it to. The lower longeron was cut as per the plans, the aft end was cut angle to fit against the F704. It also required a slight outboard twist to nest with the WD602 firewall mount.
The auxiliary longerons required a small piece of angle to be cut and shaped to attach it to the firewall angle. I marked where the angle fits on the firewall angle and drilled with a 12” #40 first and then up drilled to a #30. I had to peel the skin back and drill the angle into the auxiliary longeron. Everything is tight and fits terrifically.
The lower longerons nested great so I clamped them tightly to the 602 and drilled the bolt holes at the listed measurements in the plans making sure that the edge distance is as acceptable as I could get them, I had to move the center line for the bolt holes inboard about a 1/16th to make sure edge distance is on point.