orrr just toss the lightmaps, replace the textures, rebuild some geometry, add in much improved dynamic lighting, add in normalmapped shaders, add in either stencil shadows (Doom 3 method, code is partially there already) or shadow volumes (Crysis method), add specular highlights, environment maps, postprocessing (motion blur, color grading, HDR, bloom, SSAO/HBAO, DOF, sun shafts, et al), phong shading for terrain, LODs for BSP areas, improved PVS, probably better animations and physics for actor models, upgrade the GL version, remove dynamic glow, replace the flare system, use vertex shaders for the transforms and improve the particle physics With Unity, you already have to do most of that crap anyway (minus like, upgrading the GL version and fixing the FPS bottlenecks), plus remaking the game's animations on probably a different format and remaking the entire saber combat system, as well as all the other gameplay, AI, cinematic, scripting, and crap associated therein. It isn't worth it.