Man, it's really hard to draw volcanoes with no orange or yellow! >:U
This is what I picture Angband looking like from the top-down. Most of the fortress is subterranean, making this not even the upper most third of the map. Near the top of the center spire is where you will find Hurin’s chair. (Other above-ground structures that didn’t make it into the picture: Dragon hatchery and stable, Maethros’s shackle, and secret passage ways.)
I want my Angband to look like it was a solid, fugly square brick of a fortress that has been retrofitted with spare Utumno-parts and upgraded to suit all Melkor’s Beleriand-Conquering needs.
It’s a mix of designs: impossibly grand scaled pseudo-gothic architecture (to let you know that a Vala lives there), with battlements that are still the old no-frills anti-Oromë defense system left over from the Utumno days, all stuck in a blender with a bunch of lopsided spikes and melty Giger-esque doom.
Sauron provided the architecture and floor plan (complete with indoor plumming and practical considerations like “where do we put all the orcs”), and Melkor provided the asymmetry, the underground caverns, and the carelessly assembled volcanic hellscape.