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Warning: Safety first! Look after yourself. Be careful with the metal -- it can be sharp! Wear safety glasses at the welding machine (if you use it) and be cautious with the hot glue gun! *Don't* use this as a beginner's project (unless you have a good helping hand around!) because it can get a bit complicated. Also, make sure to set aside more than just a couple hours, because this'll take some time!
Good luck!