Hi Jeff,

Be careful with the vang loads. Catamarans have a wider traveler and do not use a vang. The mainsheet takes the twist out of the sail. Once you add a vang to the boom it will be loaded in bending, not just compression. There will also be a huge compression on the gooseneck.

What do you plan to do with the mast step?

Sounds like a fun project.

-colin