It's been really cold here since last weekend, with the high today about 10* I heated the garage up to a point that I couldn't see my breath anymore, but it wasn't warm by any means. Riveted the F-772 skin to the F-715 ribs, which allowed me to get all the clecoes out of the bottom of the center section.

Finished countersinking and deburring the main longerons. Also dimpled all of the stringers, bulkheads, tailcone skins, etc. and installed some nutplates as appropriate. At this point, I'm just looking for stuff to do until it warms up enough that I can prime the longerons outside. According to the long range forecast, looks like that's about a week away. Still haven't decided whether I want to paint the baggage area or carpet it which will maybe have me painting those panels at the same time.

I believe that once the longerons are primed, this thing will be ready to go back together for riveting!