Merge "res" folder from "Legacy Models fixed 2.31" with "res" folder in your game-folder.
Change apperance by talking to Melinda. You need to have unlocked disguises:your stats.txt file in "save"-folder must have "unlock_disguises"

Example of stats.txt content that has "unlock_disguises":
playTime = 401999
metaKeys = [unlock_flightTutorial1, unlock_demo, unlock_flightTutorial2, unlock_combattutorial, unlock_disguises]


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SDK folder contain  files that could be useful in modificating this mod\models.