If you want to be Zam for Halloween, go for it. I'm not sure why anyone's approval here matters.
Keep in mind that many (most? all?) of the folks who are on this forum are building Zams for costuming beyond Halloween, and usually that means building it to specs that would get approved by the 501st Legion. This is not a cheap, fast, or easy project. My Zam has cost me hundreds of hours and thousands of dollars so far, and she's still not done. This forum is filled with information that everyone has used and added to along their journeys. You might just want to pick one piece of the costume to focus on, search the forum for info on that one piece, and then adapt what's been done so far into something more affordable for you. Ask specific questions in those specific threads rather than asking very general "how do I make this costume" types of things, and you'll be likely to get more responses and help. When you finish one piece, move on to the next piece. Eventually you'll get a complete costume that you can wear.