crafting frame

My idea is called an Craftingframe. A craftingframe is a block not taller than a slab that is made out of iron. You need to place this craftingframe on a crafting table to interact with it. Ever looked closley to a crafting table and seen that 3 by 3 texture? Well thats how it looks like but then a little bit bigger and not flat. a crafting frame is used to make automatic crafting systems. if you place it on a craftingtable and click one of those boxes with your item the item will show up in the frame. take this example: i want to make a automatic sword maker i asemble the patner of the sword in the frame and place a hopper above it. The hopper needs to have the same items as it shows in the frame. if all the items ar hopped in the frame the craftingtable below will spit the (example sword) out or if you have a hopper below the crafting table it will pick the item up.

That my idea.