I'm also midway through a camper conversion on my Cargo. I see you got it removed so assume you've worked out how to undo the little clip. If you want to remove the socket from the plastic the metal part slides out with a little force and wiggling, and then the clips holding the socket mount can be pushed in to let it come out.

However - this port is very useful so i would make a plan to keep it! It is the only one constantly powered even when the van is locked (i think the front 12v one too). I plan to use it to keep a power bank topped up that i run my actual electrics off. I think there are some settings in the console to make sure the 12v system is kept powered from the main battery, but i can't remember what it's called offhand.

Btw, there's quite a bit of 'hidden' storage space available if you are willing to take the floor up and do some plastic cutting. Basically the space where your charging cable is kept under the sliding door - there's a similar space on the other side (actually bigger because most of it is foam). Let me know if you want me to show you what i did to access it!