Retooling the 'outdoors' grow areas (middle-top-left, and left) to be nutrifungus farms for chemfuel production. I'd put separate zones with pathways just so I could manage sowing a little better - I kept on having half sown fields, that would then be harvested on different days (and re-sown) and that just annoys me. So 'turning on' one field at a time, ensures the planters focus their efforts.
The double-geo-vent greenhouse in the top right.
The 3x3 grid of bedrooms in the bottom left - all 'countess' grade.
Lighting in the 'temple' to bring out the highlights of the high life carpet.
Finally figured out that 'Wondrous' tier was a thing, and thus the throne room is. Themed in black and gold with generous uses of paint. (The black dining chairs are actually silver, but the gold ones are slowly getting replaced with actual gold chairs).
Kitchen/corn store is mixed, and straw matted for 'walking areas' with sterile tiles under the shelves to boost the cleanliness a bit. Straw matting is because I feel it's better than sterile - cleanliness in a kitchen only matters below -2, so having a whole room at 0.6 doesn't really help much. But having straw matting means a -15 blob of 'filth' just doesn't show up as quickly in the first place. The room is also larger though, to 'dilute' the cleanliness impact of one blob of filth, and the sterile tiles push the average up just a little.
The autobong in the prison is good for keeping prisoners in check - with the right amount of leg removal, they can be so borderline on moving around, that they're not causing any trouble even if they break, but they can still feed themselves, saving a bit of pawn-time.
Most of the solar power goes into sunlamps, and most of the 'baseline' energy is chemfuel. Next on the to-do list is a better nutrifungus-processor-chemfuel power plant. Chemfuel generators also generate some heat, so this is vented in to the base during the winter to keep temperatures up a bit more, and save a little on running heaters. (But I want to try using them as 'space heaters' for an nutrifungus crop).
No killbox here, we're using turrets and 'bunkers' - the mortar pit is mostly roofed so my nudist gunner can mortar during the winter.
Generally we've got paired 'batteries' of uranium sluggers, with a goal that they're walled between them so there's no chain explosion, but one battery covers the other. So one neanderthal with a breach axe can't wreck the whole thing.
Generous use of coloured lights for aesthetics.
Morbid 'style' imported just because I really like morbid carpets, so we've a mix of those 'ordinary' high grade carpet, and high life carpets. But because I also brought in hindu style, we don't have those boring morbid sculptures about the place.
We're just about transitioning to spring here, which is why you'll be able to spot psychoid/corn planted in the snow. It's not quite cold enough to kill it, and getting warmer, but the snow hasn't melted yet.