Join Date: Feb 2000
Location: Annapolis, Md
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Assuming that the drawing that you linked to is drawn correctly to scale (which it appears to be), then the mast appears to be 27 feet 6 inches from the top of cabin to the top of mast. In terms of spar section and detailing, you really should not wing it, even on small boat (too heavy a spar section and the boat will be tender and will not spill off the wind in a gust, and too light a spar section and it will end up over the side).
Also if you have not built a spar before, especially a fractionally rigged spar with jumper struts, you should talk to someone who has. There are critical details involved in terms of how the shrouds attach to keep the mast from twisting or crushing.
In a general sense, fractional rigs are typically 1.3 to 1.4 times the length of the boat above the waterline. Mast head rigs are more like 1.25 to 1.3 above the waterline. But of course both vary widely with each specific design.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay