I set my grid size very small and try my best to mimic the geometry in the original game. I have Black Ops 1 running on my other monitor while using radiant so that helps a lot. There's a lot of trial and error but I figure eventually I might port over some models from Moon using Maya and Lime, but as they seem very low quality I'd rather make as many with brushes as I can so I don't have to spend so long re-texturing.you know wraith let you rip models & textures super easily
though yeah the BO1 textures aren't crazy