I haven't used RM maple but I'd guess you would use it as a sapwood bow. Peel the bark and build a bow. If it is 4" in diameter I'd leave the bark on for now, split or saw it in half, lengthwise, seal the ends and bind them back together with spacers between for good airflow. I've done this with osage as small as 2" in diameter. For 2" to 3" I would only make one bow from each pole by removing wood from the belly side of the bow limbs. For small diameter staves with a high crown make the belly flat...and make them a longer bow. 66" or more for a 28" draw.