Cool, I am looking forward to this build a long. I have some experience with common dogwood (cornus sanguinea) and this wood is probably totally different than your dogwood.
Only similar thing I found is when I googled "pacific dogwood" is that your dogwood has similar leaf to mine, and that's it. Probably behaves different than mine also.
For example, when wet, common dogwood here has really stinky odor and when tillering, one has to pay attention to knots on back as they seem to be like from another type of wood. For example, if one would to make warbow out of it (possible), if it would collapse, it would surely be along the back knots which seem to be softer than rock hard sap and heartwood.