Hi:

Had a 16' sailing dory with a sprit and jib for years. Could step the
mast forward and use as a cat rig. No stays. Suggest getting the book
by H.I. Chappell, titled American Small Sailing Craft. It will have
every detail you need. Since you're in Portland OR do as most of us
did. Find an old trolling poll off a salmon troller and cut it to fit
for your mast. Try Astoria or Newport. You'll find a few laying
overgrown with grass around the parking lots next to the docks. Lavish
with pine tar and turpentine. Don't let the splits bother you. I
remember there were some hippies in the 1970s cutting Doug Fir polls in
southern Oregon and selling for spars. Very organic. Or find a 1950-60s
ranch homes being remolded. Ask for two 8' studs. The houses were
framed with old growth Doug Fir. What a waste.... Epoxy two together
and shape for your mast.