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have you considered trying cinema 4d for texturing? (and maybe modeling?) I know most people don't like to use c4d for whatever reason, but it really makes some things a lot easier. you can texture as you go and don't have to draw every texture by hand. there's quite a bit built into c4ds texturing system to start with, and texture mapping is basically 1 button. unity fully supports c4d, so by the time you're done modeling, you can basically just hit "bake texture" then export as obj. and you're all set for unity