A pretty intriguing idea-all elevations, from -8 WU to 8 WU in 1/8 WU increments have been already specified in the 128 polys already existing in these maps. (There are 5 maps-1 for each texture set.) If you can live with the limitation of 896 polys per level instead of 1024, you can use these as starting points for your own levels, and you'll find you don't need to define elevation levels for each altered poly. Pretty cool... The readme describes a few potential problems (nothing major), and workarounds for these. If you're building levels that don't need really bizarre elevations, these could save you enormous amounts of time!