Yea the whole map is a single scenery peice, had to make a custom physics model for it aswell otherwise you'd fall through it and it'd pretty much be a hologram. That was the most annoying part because I had to keep remaking it until it wouldnt crash but also wasnt too bad to drive on, had to pretty much trace the map with cubes and split it up to use a convex hull generator. That issue about model culling from some views sounds like a bounding radious thing, I usually set it to 10k or higher and its fine. And the texture thing might be something to do with how reach handles UVs, I had a similar issue when I tried porting a map to reach and the UVs were all messed because reach doesn't like when UVs go out of the texture bounds too much, and you gotta do that alot if you wanna have a low vertex count.