I recently found out from a post by Knightwise https://knightwise.com/zombies-mechs-and-plenty-of-gore-this-must-be-jake-bibles-doing/ , Dead Mech is part of a trilogy by Jake Bible, but the other two books are only available in print form https://jakebible.com/buy-signed-copies/  I meant to edit my show notes before my review aired, but I procrastinated too long.