the west coast Native Americans made some nice bows wide and flat,,,narrow and thick was not their preference,,,Im sure any well made yew bow will kill a deer,,
ok with sinew on a lighter bow,, with reflex added you might get a bit more perfomance with a short bow,, rawhide backed it might follow the string a bit,, but at 60# draw,, its not an issue,, just what you want to make,, so it really depends on the design,, I have an osage bow that is 54 inches rawhide backed,, it follows the string a bit,, but at close hunting range that is not as issue,,
if I wanted a bow that short to shoot through the chronograph with impressive speed,, I would sinew back it,, but like I said,, a 60# bow is very effecient for killing a deer,,sinew backed or not,,I have killed deer with self bow, rawhide backed and sinew backed,, they all worked well,,