Lots of Good advice here.
I have seen that argument before WillS and it just doesnt make much sense to me. D bows are simple and durable which is why they are/were used around the world. All woods lead themselves to a D tiller, not just yew. +1 to osage outlaw
For your 29 in draw and your lack of experience, id say go a bit longer. You can always pike it down if it comes too under weight.
A 58 in ntn bow is a pleasure to carry and shoot but it would be easier for you to make one that is about 64 in ntn or so as Bushboy says. Get the limbs bending evenly to about 23+ inches, then get the center flexing a bit, then move back to the limbs. I dont take measurements. Everything is by eye and feel.Typically the handle is between 1 1/4- 1 1 1/2 or so and depending on how you make them, the tips taper considerably or not much at all. It will come together.
Also, i have found leaving the handle the widest and not narrowing it, is much easier to tiller although having a slightly narrowed handle that bends is a pleasure to shoot as well. Your choice.