RE: WACO YMF
When I built the fuselage and tail of mine I built the elevator horn and push rod to stay inside the fuselage. Was not really hard just stiffen the elevator joiner and install a music wire horn in the center to drop down inside, a little trimming of the fuselage formers and it worked slick. Of course if you are past this point you will still need to exit the fuselage. If this sounds like the way you would like to go I think I still have pictures somewhere.
Larry
WB 183