I know that Way Beyond Cakes by Mayen did a Lego Ninjago cake and I think she used molds for the lego figure then made the accessories. I don’t know where I saw the post but I know I saw one of molds for the bodies somewhere. I would contact her and see if she has any advice. I myself have never done legos. So I am sorry that I can’t actually help you with it. Good luck though!!!
Melissa