so heres my take on it,
Hickory is an awesome and oft underestimated bow wood- it makes for great bow backings, and in my opinion is the best beginner board bow wood- its forgiving, its tough, its readily available and its very affordable.
However :D it is a wood where its tension properties exceed its compression qualities.
and a primary rule in wooden bow building is to build what the wood is telling you, not always what you want to build.
your bow design should match your wood specie.
Hickory likes to be wide and have a flat belly, this is in order to help the compression weakness of the hickory, now you can do a few things to mitigate that, you can trap the back, and heat treat the belly, and it will make an awesome bow. but if i hade a piece of hickory i would build it 1.75 to 2" wide for half the limb or more then taper to the tips, with a perfectly flat belly.
Quite different from an ELB's dimensions!
now there will be some awesome bowyers on here that will have built very successful ELB's from hickory- this is just my take- to work with the wood, rather than against it, especially for a first bow.
now a hickory back and say an ipe belly makes for an awesome ELB- done a few of them.
Hickory and osage board is another, hickory and yew board- if you can get it!
and there are many other good compression strong woods out there too!
IPE can be found at most lumber yards, its sold as decking( Brazillian Walnut), or get hold of decking supply places, or specialty lumber supply places.
oh and with Ipe and yew especially wear a good respirator- it can create a mild allergic reaction!
good luck!