I have some doubts about Ash for ELBs, first ELB I made was English Elm (60 lb draw weight @28"), I thought it was great...until I made a Yew one, The Elm chrysaled on the belly and was dull compared to the Yew....I suspect Ash would be similar.
Go for it, but make it long and maybe a tad wider and not so deep a D as you would with Yew.
I've made a couple a short Ash bows with a flat profile which I pushed to the limit, the failure mode was chrysals on the belly, so I think Ash is better in tension than compresion and thus not suited to a deep arched longbow cross-section.
Of course I could be talking out of my rear end.
Hope it turns out good, I don't mean to be a missery guts....
Del