Reddit mentions of The Charcoal Foundry (Build Your Own Metal Working Shop From Scrap Serie Book 1)

If you're not afraid of DIY, maybe try Gingery?

There are many unexpected dangers in metalcasting and I didn't watch the whole video to see which ones they warn about. A good book is the first book of Dave Gingery's series.

If you aren't machining the material afterwards, cans are probably OK as a source material.

I'd love to see a video, but there's a book series that describes something along those lines:

https://www.amazon.com/Charcoal-Foundry-Build-Metal-Working-ebook/dp/B005STTBBM

you might get away with melting Aluminium, but to be honest if you plan on doing casting you'll want a forge and a foundry. the foundry is a better shape to handle a crucible, and inappropriate for most forging - but it can be done.

but for that you want to go with something like a kaowool and hot face - if you want portable.

have you looked at http://www.amazon.com/Charcoal-Foundry-Build-Metal-Working-ebook/dp/B005STTBBM/ref=sr_1_2?ie=UTF8&qid=1463618766&sr=8-2&keywords=gingery