The transfer of graves from the upper fort into the dome continues. My stocks menu shows a little less than 650 coffins, most of which are used. It's impossible to know for sure (without meticulous counting), but I'd estimate my death count at around 575. However, the new 'coffin gardens' are placed 'outside' the buildings in the dome, so if the affair is ever flooded with magma again, things might get a little messy. Then again, with the bugs I experienced last time flooding occured, I doubt I'll try it again.
When I first began conceptualizing the dome, I planned on building platforms in the deep, and then collapsing soil layers from near the surface into the grotto so that underground plants could grow atop the buildings. I abandoned that entire plan in favor of simply flooding the tops of buildings with water to muddy them. Happily, with the magma flooding, those buildings are now topped with layers of silt or red sand (no more mud, which makes things brown and ugly), and are quickly being covered with floor fungus and cave moss, not to mention various large fungi.
Also, quite unfortunately, the mines which I had dug into the only adamantine vein on the map have flooded with magma. In order to explore the caverns, I smoothed walls and carved fortifications to reveal unexplored areas. Some of those areas in the second layer are quite filled with magma, so the stuff dripped into the deepest mines and has now rendered the adamantine vein temporarily unavailable. However, I already had plans in place to obsidian-cast layers of the magma sea in order to obtain adamantine which was adjacent to magma, so this is not really a huge problem in the grand scheme of things. Once dwarves have been permanently sealed below, that project can begin.