Well, I would do the drawbridge but that's boring. Would floor connected to a retracting bridge collapse? That way, I would have a semi-repeatable disposal method. The cage is wood, but how would I be able to get hostiles to go on the bridge for later use? The only way I see is making it the only path into my fortress, and have a pressure plate at the far end to drop all but one of the invaders. Decided against the arena to prevent a possible fortress-destroying rampage.
I wrote up a way to make a rebuildable suspended floor trap a few days ago - will try to find it and post a link here.
Meh, will just repost it, not link it.
Process which seems to work for consistency - and which will also allow you to rebuild the exact same way after collapsing the trap.
Step 1: Create hallway
Step 2: Channel down all the tiles - I left the slopes at the edges of the excavation so dwarves could climb out, then built a tunnel later - could have just as easily built tunnel first, then removed all the upward slopes.
Step 3: Build all of the floors that you want to collapse, as well as one floor at each end for your dwarves to build off of, and for them to build a support on at the end. I used grey stone for the main platform, and dark blue for the two end tiles that will end up being supports.
Step 4: Build the bridges and the supports.
Step 5: Deconstruct the built floors under the supports - you no longer need them. Use the d -> n command. If you don't deconstruct the floors under the supports, the trap won't work at all
Your dwarves will happily cross back and forth across this platform with the bridges down
Your dwarves will not travel across the platform with the bridges up, because supports are impassable terrain, and there's no floor under them anyway
If a building destroyer destroys the bridges and support at one end of the platform, big deal - send out some marksdwarves, or set up ballistas.
You can build cages, traps, and chains for animals on the constructed floors as well.
After the initial excavation, the entire building process can be done without entering the hole - and it doesn't care which side you start building from, unlike bridges. The 4 small bridges shown will not be destroyed in a collapse, even if they are extended - however when rebuilding the platform make sure to raise the bridges or the dwarves will make a hash of the building process and drop a lot of rocks and require lots of re-designations of construction.
*NOTE* This will have no useful value against flying critters