I actually have one inside of my base , it was kind of a tight fit, but I can confirm they will indeed fit inside of player bases!
I have the hanging tank in between the Demon Worm and the Trigon's Skull in my base so it's a tight fit but I would love if there was a way to increase the size of our base maybe add a room or two more.
Me and the gf, run a 2 person league. So, I have all the space in the world. I just leave a room for her to decorate.
we need more bases TBH, possibly a upgraded base from what we have. Like bigger bases I mean. Yea the upgraded 1s from the free 1s are bigger but the 1s you pay for arent even that big IMO. I'd like something like half of a league hall or something lol
Now that, that is an awesome looking base. I love how everything is laid out. It makes it look like an actual base of operations. I did I spy a little torture chamber in there