The first children of Whitemountain have grown up. Two of them hadn't mooded during their childhood, so i gave them a single job each, one armouring, the other weaponsmithing. The armoursmith has mooded - he likes brass, so it became a brass gauntlet, but he's producing nice masterwork steel armour now. However, i mainly wanted to make use of all the beeswax and clay that had piled up in the ~15 years the fort had lived already and that i just couldn't spare the dwarfpower for. He's now a great wax worker and so legendary at making earthenware crafts that "potter" is listed as his job.
I've been buying all arrows the elves brought and most of those imported by the humans and assigned another child as one-dwarf bow squad. I unassigned the main meeting hall because he was involved in one of the infamous adolescent parties and i wasn't going to wait a full season for the party to end. Once he was activated, he started thrashing through wooden arrows and is now, half a year later, an elite bowdwarf (after i ordered him to shoot four of our captured unicorns), burning about 1500 arrows in the process. I'll probably better issue him a sword later so he can spend time on other skills, a full training regimen just isn't sustainable with maybe 400 imported arrows per year.
And i cleared the chamber that'd been flooded with lava - fortunately, it had been shut off with a magmaproof door, so i just built a minecart round track, placed nine pressure plates on it and linked them all to the door. The distances were a bit off, but it still went through seven open/close cycles in 140ish ticks, and whenever lava flowed into the door space while it was open, the closing door crushed it. This takes quite a while to really clear a room, since free-flowing liquids are rather sluggish, but after a week or so all lava in the room was down to 1/7 and it started to evaporate. Downside is that opening/closing buildings via mechanisms eats unreasonable amounts of fps, with the door set to flicker, i got 22 fps when otherwise it was a bit over 40.