I'm trying to accomplish multiple things at once. My first objective is to floor over the roof of the overfort 7-8 levels up, where I will construct a massive windmill farm to power pumps for my not-so-soon-to-be dining room advanced mister system. With the number of gear assemblies and axles I'll need it may turn out to be a waste of time, but I can always augment it with some water reactors.
I'm also creating a new magma forge area on top of one of the auxiliary magma pipes in the first cavern level. This will significantly speed up my metalsmithing operations, assuming there's someone idling at all times. I intend to floor over the entire pipe except for spaces for the forges, and use it as an ore storage site. The muddy ground I'm forces to wall in will make good tree farms and give the farmers jobs as herbalists.
The next thing I'm going to do is construct massive statues and/or shrines for all the deities. I've made blueprints for the statue of the mineral goddess Onol. Here's a copy of them;
I've dug, smoothed, and will soon stock and furnish a zoo/second dining hall for my dwarves. I'm putting in place some fancy glass portals for the doors and will engrave it all, put statues in the corners, so on and so forth.
All this while preventing the constant stream of ambushes from dulling down my fairly pathetic military. I may have to spend a few hours making it more effective as well. At least I have a constant stream of brainless, soulless meat-bags to restock it.