Well, i'm at work, so i wont be looking at your save. But i can tell you what I do after building a trap gauntlet, providing for all my dwarves needs, smoothing and engraving, training a military, and building bedrooms for everyone.

+Megaproject+

All my freeloading dwarves are made masons, and told to build a tower. A tower made of expensive stone, or perhaps iron. Pave the floors with certain color stones. Make patterns. This tower usually serves a function. Is it perched over the meeting hall, held up by a single support? Is the uppermost room the tomb of your greatest hero? Both? In this case, place the lever somewhere completely accessible to an angry dwarf. Maybe at the top of the tower could be a dwarven-bridgeapult. See how far you can launch unwanted babies. Or multiple babies. Props if they are on fire before launch. Double props if you manage to land them in a pit of helmet snakes. Perhaps you could create a series of pits, arranged as an archery target, with progressively more dangerous creatures as you get closer to the bullseye? Score yourself based on where they land. Actually, I'll get back to you. I've got dorfing to do.