That is a rather substantial mast. As big as a mizzen mast on a similar size ketch. If it was added by the owner, then I would want to know that a naval architect designed it for that boat. That mast will put substantial loads on the hull, and it needs to be designed like a sailboat mast.
It has stays so it is important where they are tied in. More importantly where does the foot of the mast rest? There needs to be support all the way to the keel.
David
David