The hunt for a good mannequin seems never ending. I’ve built several over the years for everything from Vader, Maul and even my Ledger Joker. I had a killer full set of Fett armor years ago that I sold because I was so frustrated with crappy mannequins.
Any cheap manny can be used to get a “good enough” look and it will hold your armor. But if you want an authentic looking display you’ll have to go custom. I would just buy fiberglass manny’s and Frankenstein them with PVC, duct tape, custom made hands, etc to get the look. I can’t believe that in 2020 nobody has a GREAT mannequin for this kinda stuff!