I think it would be perfectly legal, since Tale of Two Wastelands does the exact same thing using Fallout 3 assets. I personaly will make mods for myself (I'm not uploading them though) with assets on MY PC if I like them. I may have over 1TB of free space on my Hard Drive but if they keep adding more content (and more assets), I too will run out of space eventually. And hey, if you want Black Power Armour, before you buy check out mine: Spec Ops Paint Job Shameless plug I know, but it's free. Yeah 'cause I mean, you're not paying for the assets; they were included in the FREE MANDATORY Update that everyone had to download if they wanted to play Fallout 4. When you buy a CC mod, you're just paying for the plugin that adds the items to the game. It's like if your friend wants to sell you his key to his car, but he lives with you and the dumbass put your name in the car's papers. Why would you buy his key, when you can just go to your parents, who drive the exact same car, and get their key for free? Better yet, why not just take your parent's car? (Which has more features and is better maintained than your friend's junker.)