True, but Kegetys' Hawk was the first user made OFP addon that had completely NEW model
, this wasn't possible before Oxygen.
User made OFP addons started coming right after the 1.1 patch as it made addons possible. AFAIK first retextured addon was Kegetys' Masterkey, though it had only new brownish handle ;D. During those times addon makers had to use Hex editors to replace textures. find texture paths and so on. It wasn't possible to view textures outside OFP so you had to view them in mission preview window ;D, thank god BIS released Texview. Also without Texview you couldn't convert textures to paa or pac format, so they had to be JPG.
First retextured island was also made by Kegetys. Before his Winter Kolgujev there where some modified islands like Everon with sand textures and stones. Ebud made also an island masterpiece, Jungle Everon.