Skybox shown, not fully functional

Skybox draws around camera, and its draw call disables backface culling
so it's visible from the inside. There is also a skybox texturecube, but
it is as of yet unused.
Problems: Unlit Materials do not display, so I am currently modeling the
Skybox based on the diffuse material, so it is lit.
Adding a texture to a diffuse or unlit material appears to do nothing.
Sky no longer lit
dds file now bound as texture

still not displaying right, but that's a shader thing
Shader modifed

Still sketchy, not sure how to proceed