I think it'd be a great idea be able to pay a construction fore-worker to install an advanced workbench in any player owned base. But if its a small and cheap base maybe make the bench cost more, a bigger and harder to make/buy base, make it cheaper. Also maybe rentable adv. workbenches. For example, ADV. workbench for,
Cave or Depot - Buy = 40,000 caps, Rent = 6,000 caps (per real life week.)
Trapper Camp/Gas Station - Buy = 36,000 caps, Rent = 5,400 caps
Scrapheap - Buy = 32,000 caps, Rent = 4,800 caps
Outpost - Buy = 28,000 caps, Rent = 4,200 caps
Old Bunker - well, since it already costs 500,000 caps, maybe get one for free? But if not, at least make it cheaper maybe. Buy = 15,000 caps, Rent = 2,500 caps.
And please, if there are many trolls reading this post, try to hold your "this is the stupidest idea since the spore plant guard" comments.