I always go with 10" levers nowadays, good length for lateral stability at low width. No taper in the working limbs so every inch should bend the same as the next. Count the levers as part of the working limb, yes they put more stress on the inner than bendy outer limbs but not by so much that I've had to build them any longer than my other shorties.
If you rough out the belly with a hatchet or machete start at one fade and work toward the middle of the working limb, then finish from the other fade. I usually start with the grip end and finish with the lever end.
I make my outer fades 1" long and they taper to about the width of my thumb at the base of the levers. I start my width taper an inch or two from the base and worth the tips down to about 1/4" by the time I'm at low brace, a bit less when it's all said and done. I work down the thickness after establishing width a few scrapes at a time, checking the brace and draw until there's just the tiniest hint of bend at the base of the levers.
Overlays are essential and in my book side nocks are just unnecessary weight.
It might not be completely true to the artifact but we don't actually have all that much of the bow