Of course the brain goes in the trunk… or is his body also his head, and vice-versa, these are some weird critters fo’realz afterall.
So, that rack just behind him to his right is the equivalent of his extended central nervous system, a conveniently replace-able module for the evolutionary development of the building blocks I’ll need for higher level robots… also akin with where Nature was at this point, in that metaphoric artist/scientist kind of way.