Sound maker, no offense taken. I know that basically "any" wood CAN make a bow. You 'just' have to design it accordingly. All I'm saying: Western red cedar is very, very low on the bowwood scale. Since I guess that you are quite new to bow building (correct me if I'm wrong), and you have already broken a piece of this cedar, and you are trying out a rather complex design that requires a very good bowwood, I just want to save you the disappointment. There's just too many ifs and buts in your plan to guarantee a succesful outcome. If you're after gaining some experience in wood working, then you can go ahead and continue. But if you want to make a bow that actually works, I think there's a ton of better woods and easier designs. A non bowwood such as Western red cedar requires a design that puts a really low pressure on the limbs. Very wide, flat and long limbs are crucial for those weak woods. Three things you probably can't incorporate in your design.
One of the things that stil bothers me, is that you still don't actually know the wood species. It matters a lot! You really need to figure out what species of wood you have. I know that native people have used various 'cedars' as bowwoods, including Eastern red cedar (not a cedar but a juniper) and incense cedar (not a true cedar either). I don't know if they used Western red cedar, but if they did, I would not be surprised they used a meticulously chosen branch of compression wood. And then there is Spanish cedar, white cedar, Lebanon cedar etc. etc... All with completely different properties of the wood, so all need to be designed differently as well.
