I suspect that there were some suggestions about base upgrades, like additional lockers but there was probably encountered a problem of possibility of spamming places with unremovable items.
I suggest for base upgrades the altered crates carrying script, when you can drop a purchased item only in designated spot.
1. You purchase a heavy upgrade item from vendor which fills your inventory entirely. (like picking a crate)
2. You carry it to your base, which has spots for upgrades (like areas where you drop crates)
3. The upgrade is been installed once you dropped it in the designated spot
4. When you drop it elsewhere, it's lost, like a crate.
5. Same when you get killed.
