I did the OP list and all this except the floor/firewall. Basically anything steel went to powdercoat. Also the front hub steel L brackets.Floor
front and back “firewalls”
core support
battery hold down?
pass foot kick plate
trans mounts
rear toe “dead bar”
steering column brackets
boost gauge holder
seat mount?
mine are powder coated gloss black and are installed using rivnutsI don't think I've seen many goblins with the floor and firewalls powdercoated. Most are painted and or truck lined. That would look great though!