Re: For an oak bowsprit, is epoxy OK?
I'd agree with the advice about d. fir instead of oak. That extra weight hanging way out in front doesn't do your pitching moment arm any favors, and fir is well established as more than plenty strong enough. But if you do want to go with oak anyways though, Mrleft is right, 8/4 white oak is by no means a rare and exotic thing. You're just not going to find it at Home Depot--look up "Hardwoods" in the Yellow Pages. Avoid the hassle and suspicion of any glue joint by just getting a piece that's already that thick.
Amphibious Macroplankton Oughtredia doublendus
Mostly found frequenting the littoral and estuarine zones in the southern half of the Salish Sea, though sightings have been recorded both north and south of this area, and occasionally, but rarely, inland, in freshwater environments. This species lives on micro-brewed beer and dutch-oven biscuits,and displays brightly colored nylon and gore-tex plumage during the rainy season. Approach with caution!