Aluminum will be a bit more difficult of you need to do any welding. the flat sheets of metal will require some skills in shrinking and stretching as well as some wheeling. on a rod replace the wood with formed square tubing as this works better..
glass will require some molding skills to do succesfully..
your choice and it comes down to your skills as well as the types of tooling you have to work with..
I have tried most all of it and now do what is known to work..