carbon mast with balestron type carbospars

[rapanui 2]

Hello there! I am building a motor cat with an auxiliary carbon mast and a balestron boom, as anybody as experience with this rigging?
the cat is 50 feet long with narrow hull and 2 yanmar 40 hp calculation bring me at 12 knots with the 2 engines at 2400 rpm the cruising speed recommend by Yanmar, the mast in there for atlantic crossing and favorable wind.