Hi
Decades and decades ago, I was a student at UW, so feel a special duty to reply to someone from WA. In case your request for a mast and sail doesn't get you exactly what you want, have a look at David Omick's masts article in JRA magazine 89. He built four masts for his catamaran using piping. He was Oregon based so same materials are probably available near you.
His boat was bigger but he was spreading the sail area over several masts, so his were in the size range you are interested in for your smaller boat
Best