I'm considering making a fortress with the express purpose of revisiting it in Adventure Mode as part of a personal challenge to kill a representative of every living creature (undead aside). Naturally, this is going to require some skill training, and I'd like to be able to store the skulls in some kind of trophy room for bookkeeping purposes. Aesthetically the whole place will be like a big dwarven-engineered Batcave.
What I'd like are ideas on what to put in the fort that will be useful in Adventure mode. I'm thinking that I'll want at least a lead bin filled with steel equipment. I'm also planning on a swimming pool and a lever controlled access to HFS. I'm debating an arena I can put creatures in that can be released via lever, to save some travel time. I'll need a magma-chute to "clean up" after the digging is done. I'm also debating an automatic danger room- I'm very much on the fence about that since it somewhat undermines the point of the challenge, and I'll probably ignore it on my first (hopefully only) attempt, but I'd hate to find that my only option for survival is letting undead groundhogs beat me to buff armor skills- at that point I may as well use the danger room, since it is just as exploity.
I'd also appreciate any advice on what kinds of effects abandoning has on a fortress- I know items get scattered randomly, but what happens to tame animals? Hostile units on the map? Friendlies? Built buildings like beds/cabinets?
Bonus points awarded for style!