Flight Tower

Mojang, you should add Flight towers, crafted by the nether star in the middle, an elytra on the bottom, and glass all around. What it should do, is allow flight to players in a radius for say 10. However adding iron blocks to a HUI will increase the radius, Iron will give 5+, Gold will give 10+, Diamond will Give 30+, Emerald will Give 20+. These are examples. However this should be shown to the player by having an effect called "Flight"  I feel that this is balanced because it requires items earned from bosses, and it gives the nether star a new use, instead of using it as a beacon to encourage players to fight the wither and not skip the boss.