I've had a big obsession with the death star for the last few months, thanks to Rogue One.
I'm new to creating textures, so it's been an evolution from getting a basic representation of a death star texture, to gradually rebuilding the textures accurately (at least the parts around the main dish). The textures were mostly made in After Effects with fractal noise. I converted them to 8K for rendering with Octane.
Other models are free that I found on the internet.