what i was looking for was a portable item that when right clicked open's a furnace GUI the furnace would need to keep its inventory on being closed for obvs reasons so that you can carry it and cook stuff as you mine! if anyone is up for this i would be grateful thankyou in advance
Very useful idea indeed. I think that it should have some sort of handicap to it otherwise it would be too much used as opposed to normal ones.
How about it slows you down (you have to be careful when carrying something that can smelt iron), or you can only smelt a maximum of 16 items (portable size also means smaller portions), or you can only have one at the time in your inventory?
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To do this you would have to rewrite the entire furnace system to work with item nbt tags, or what ever you are going to be using. Quite a lot of work to me, seeing as I have tried this before. +1 to whoever can get it to work for themselves.