At long last I finally mounted the HS-908 brackets to the horizontal stabilizer spar. Then I assembled the ribs and spars into the skeleton of the tail assembly. Lots of drilling to enlarge holes, follwed by lots of vaccuuming to stay ahead of all the aluminum shavings.
Next step in the instructions: dissasemble all these parts. Going to be lots of this try fitting as I proceed.
Time: 4 hours