With some more work I now have textured BSP levels going. Take a look.
No lightmaps yet. And the psychedelic colours in the previous post were still an error made by me. The real colours are much nicer.
The current rendering is slow as hell (not fps but spf, if you catch my drift). That's mainly because I'm not using the visibility information yet to cut unnecessary clusters. I'm also being quite liberal in switching texturing on and off, and not caching any of the textures. So some obvious improvements to be done.
But that's for another day.