Just remember, no scenery yet (minus 2 items). Lightmaps and shaders are temporary. And due to the 8 year old rendering engine, some errors occur which I can do nothing about, plus my limited portalling knowledge.
EVERYTHING in this video that isn't part of halo 1, was made from scratch.
Continue discussion from old thread here.
Also the redish glass on the hanger roof is just because of a really quick shader. will be fixed soon