I used yellow cedar, but Annie has bought some douglas fir for her mast, a more usual spar-making timber.
In my case, for fitting to a 6 m x 152mm tube, the staves are 4.2m long, 88mm wide at the bottom, 53 wide at the top, with a convex curve to give 79mm width at mid height. The bury in the tube is 400mm.
Cascamite, or preferably Resorcinol, could be used as an alternative to epoxy, but the joints would have to be more closely fitted. I would suggest cutting the 30 degree angle with a hand-held circular saw, then passing the staves over a surface planer set to 30 degrees, as a way to get them fair and true.