Trying to create an inventory system, which generates a section with each item players may have

Hey guys, I'm a junior game dev kinda new to the whole thing. I've been tasked to create a "hangar inventory" in which players can own their certain items (in this case mechs) and their skins, they want me to create a hangar, and when a player owns a mech, it has those mechs show up in the hangar, and they can walk around the hangar and have a look at their mechs.

Also, I am required to script it so when a player owns more mechs, a new room down the hangars ''hall'' can spawn and they can just keep walking down into more rooms, with the more mechs that they own.

Any ideas on how I can achieve this?

Appreciate the help in advance <3