|First, get the C&C 25 specs since that is your boat. Second, if you can locate a windsurfer mast which no longer belongs to a board, they make great poles as they are light and strong. Then you have to insert the end fittings you want plus the center eyes for pole lift and pole down haul. I am afraid the fittings will cost a few $$.if you are lucky, you can find a pole that has been wrecked by being bent, but with the fittings intact. Then you can cannibalize.
Note, the w.s. pole is about 15 ft, so probably will have to be cut down for your class.
Good luck, maybe I will see you on the waters of LI sound? My boat is Magique.copasetic