I have used azek for built up window trims/sash. Have all helical head jointer and planer and no issues. Have also made azek domino's for attaching azek trim at corners. Azek dominos and azek glue make a very good corner trim, with the domino's mostly keeping the pieces aligned. No problem milling the material, but yea, don't think I would use it for a saw plate. Also you can glue up the smaller pieces to make siding blocking for wall penetrations.