The Upgrade Modules that are intended for the Cyclops are crafted using the Cyclops Upgrades Fabricator (not to be confused with the Fabricator) onboard the Cyclops located in the engine room. The Upgrade Modules for the Seamoth and Prawn Suit are crafted with the mini-fabricator at the Vehicle Modification Station.
Upgrade Modules for the Cyclops can be placed in the upgrade console found in the engine room of the Cyclops. Four Upgrade Modules can be applied at once but there are currently no modules with effects that stack.
Upgrades to the Seamoth can be placed in a panel on the Seamoth's left side. Like the Cyclops, up to four Upgrade Modules can be applied at once. The Seamoth also has a Paperdoll UI like the PDA. Certain Upgrade Modules such as the Storage Module can differ depending on which slot it is placed.
Upgrades to the Scanner Room can be placed in a panel inside the Scanner Room. Like the Cyclops and Seamoth, up to four Upgrade Modules can be applied at once. The Scanner Room also has a Paperdoll UI like the PDA.