top angle of z-frame cuton outer side 3cm from rear edge at 120 degree on top of joist (upper most bed rail)
mid angle of Z-frame cut on outer side 19.6cm from rear edge at 120 degree on top of joist (mid bed rail, where matress will sit
bottom angle of Z-frame cut on outer side, 3 cm from bottom edge at 120 degree (floor support)