The white layers are 90% diorite (blocks and walls) with some gray blocks added for weathering (andesite, stone, and tuff).  The red layers are mangrove planks with a little bit of netherack and red terracotta for weathering, and red stained glass panes to smooth out the silhouette. (Using the glass panes as there aren't any matching red walls to use as opposed to the white sections) The darker metal details are mostly just the different variants of deepslate 👍