if you make it 2" wide and it is ipe, that is going to be very thin
ipe doesnt take a lot to make a great bow, ytou can keep it narrow and a little thicker.
i always like a rounded belly when i use ipe.
if your only using hand tools,yes it wil take a while to reduce it to floor tiller etc.,however take your time this wood makes great bows.
i have made a couple from boo/ipe with only hand tools and liked the end results,hurried into one of them and ended up coming in under my intended weight
so just remember patience patience patience.
i wouldnt recomend a draw knife,theuy can dig in real quik if your not carefull,when you do ue it remember to use it with the bevel down.
i would recomend a hand rasp or a sureform.they work well on ipe,always wear a mask it can irritate your repritory system etc.
good luck
peace,
tim