This wouldn't work as the server is 1.8+ compatible therefore blocks released in 1.9+ can not be used in the server. If we wanted to add these blocks then HHG would have to switch to 1.12 only, but that would kill all of the pvp community and the server numbers will gradually start to decline, faster and faster. I wouldn't risk HHG dying quicker than it already is, just for some fancy blocks.