Last year I shipped a RV-4 in a 20ft container to Germany. The fuselage fit with the spinner removed with a few inches to spare. The -6 should fit.
Here's the photos I have showing how it fit.
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N673AC RV-7 borrowed horse
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.