Though forging metal can be a highly dangerous thing and in a SHTF world injuries you could suffer may be life threatening. If you are not trained you may want to consider getting proficient today. That said, you are looking an at amazing way to transform scrap metal into usable materials. There is really no limit to the things you can make with a working forge. With the right tools this creation seems pretty easy to make.
What you will forge is another story altogether. If you think this would be a good addition to your SHTF plan I would suggest you begin reading and learning about the practice of forging metal today. Aluminum is a cheap and easy way to start. You can even use recycle soda and beer cans by forging them into various items.