Here are just two of my dozen pictures of the rotating, unstayed mast on Alex’s 45′ cat building up in Bellingham. Jim Betts did the mast construction. I did the design, with FEA help.  More pictures soon. In the first see the mast and balestrom, as well as crane lines.  Second is closer to the carbon mast at the bearing area.  See the splines that the balestrom slides onto.  I hear launch is soon.