Started taking the aft fuse assy apart. Got the 0.040" think aft-most tail skin off first and decided to machine countersink the rivet holes.
The prepunched holes aft of the last bulkhead were a little bit out of position. Wound up with elongated holes, and in extreme cases nearly "figure-8" holes. Will need to measure and see if there is enough edge distance for -4 rivet shanks.
In order to complete all of the holes for the aft-most bulkhead and side skins, needed to fabricate the rudder stops. Did so, and mounted them so the aft most rivet holes were aligned with the existing pre-punched line.