Yeah, that was pretty cool. Some tips: I recalculated the lights at the beginning (a habit for me, you know how sometimes a loaded map doesn't calculate lights the right way, right?), and it took literally 5 minutes or more to finish calculating, with over 100 textures made. As found on the Sauerbraten editing reference:
lightprecision P
Default = 32. This is the most important variable for tweaking the lighting, it determines what the resolution of the lightmap is. As such has a BIG effect on calculation time, video memory usage, and map file size. The default is good for most maps, you may go as low as 16 if you are lighting a really small map and love hard shadows, and for bigger maps you may need to set it to 64 or so to get reasonable memory usage.
The number to watch out for is the number of lightmaps generated which are shown on the HUD (and also as output after a calclight). 1 or 2 lightmap textures is very good, over 10 lightmap textures is excessive.
The map file size is 90% determined by the lightmaps, so tweak this value to get an acceptable quality to size ratio. Look at the size of the map files, sometimes a slightly higher lightprecision can halve the size of your .ogz.
Every surface matters, even though the engine attempts to compress surfaces with a uniform lightvalue, it is always a good ideas to delete parts of the world that are not part of your map. Lightprecision, lighterror, and lightlod are stored as part of map files.
I also have to point out that even after the calclight, a lot of areas, especially on the surface, looked "patchy", like this:
If you'll also notice, there's a "operation allowed in edit mode" thing, I think that may have to do with the map. I also have a very low fps (19), so it does lag a bit. What scares me is that although sandbox is normally slow for me, I was playing in a lower resolution, which normally makes my fps skyrocket, so that number should be lower than normal.
There's a teleporter which takes you to a dead end at the bottom of the cavern, and there's also a funny "E" at the map top. I know this is a WIP, but what's with those?