Middle bit looks good.
Yes, treat it like Ash, flattish belly, narrowed back, heat treated belly, keep it long.
I made one some time back, it turned out very nicely, it's on my blog if you search for Elm or Elm Warbow.
Keep the underbark surface as the back of the bow.
Leave the bark on, seal the ends give it a year to season, some people may advise you remove the bark early. Whenever you take the bark off do it V carefully to give yourself a perfect back.
Del