Chestplate+Elytra and backpacks

So normally you don't care for the idea of a chestplate but I have a idea that could change your mind so 1 You could make it where you can only put it on a netherite chestplate so that early gameplay with this would be harder, 2 You could make the chestplate weaker in defense keep the durability cause thats what netherite is about so you could cut 1/2 off the protection because of the elytra to take for the flying part on the chestplate, now protection 2 would take it back to full, and protection 5 or 4 would count as protection 3 or 2 to make this fair, and the crafting for this would be putting a chestplate in a anvil with a elytra. And now for my final idea for this is you could make another thing to add to the back of the chestplates could be a backpack the crafting could be two string in the top and 6 leather on the bottom 6 crafting squares but this would only add 9 more slots and to access it you just open your inventory and it would be located next to your chestplate as a little switch which you click to unlock 9 storage stops to the left of the chestplate and click it again to close it and for more mabey add the ability to add bundles too both sides of your leggings which will be the same as the chestplate but only 2 storage spots for each bundle with only a max of 2 bundles. Now for how they are equipped just put then in a anvil, also they cost 5xp and for the second bundle it cost 10xp, also this does not effect enchantments Thank you for your time Camohunter out