Spars were green willow, chosen because it was the only species that could be legally cut on the nearby wildlife refuge, and it grows somewhat straight in the needed lengths. It's wonderfully low-aspect, the yard can be kept light, its very simple to rig, and no boom to slap you in the noggin. The yard is a little crooked, so I first oriented a crook upwards to serve as the halyard attachment point. Then I folded the sail as best I could over the crooked parts, and trimmed the excess. The yard sleeve is then duct taped right over the yard.
Darts are duct taped in at the tack and throat to shape the sail, fastened on both sides.
Becket is a thick strap of willow bark. Friction on the halyard was not an issue at all on this scale. An initial experiment using an oar to steer convinced me that a real rudder would be nice. Counterweight is steel shot cast in place with epoxy. Tiller is a willow sapling, with a slot gnawed out with a skillsaw for the rudder head.