/summon FallingSand ~ ~1 ~ {CustomName:"Floor",CustomNameVisible:1,Block:stained_glass,Time:1,DropItem:0,Riding:{id:"ArmorStand",CustomName:"Stop",CustomNameVisible:1,NoGravity:1}}

past that iinto a command block, trun it to always on, clone it with you mouse key (Mine is the middle key plus ctrl)), Then place it down multiple times....

I end up with an weird block??