trimmed the notches in the aft end of both longerons & after much measuring and checking against the aft deck & vert attach bars, cut the notches for the vert bars. NOTE- the print has a callout for the radius inside the notch for the vert bars to be 3/32 in both inside corners. This is confusing, because a 3/32 radius is derived from a 3/16" hole, which is the width of the slot. This would make teh slot more of a U shape rather than a rectangle with rounded inside corners.
Not sure if theres a typo on the print and they actually meant 3/64" radius or what, but the whole concept is to make the slots barely bigger than the 3/16" thick vert. attach bars, so I established the bottom of the slot/radius by drilling a 3/16" hole, but backed off from the actual bottom of the slot a bit, cut the slots with a hacksaw, then filed everything to fit.
I had left the aft end a little long until I could compare it to the tailcone, because a lot of stuff has to fit pretty precisely, but I shouldn't have bothered. It was all dead on. I only hope the front 1/2 matches the sidewalls & firewall as good!