Just a few pointers.
First steel walls aren't always a good investment - they aren't the strongest (between wood and stone in health) and worse they are flammable so they can spread fires - last thing you want is an fire storm spreading into your colony via your walls. Granite is the best bang for buck if you have it in your seed - if not any other stone will work as well.
Second (and i may be wrong here as your images are quite zoomed out) your fridge isn't very efficient - doors and walls conduct heat and so will force the cooling units to work harder - the most efficient design makes use of double thick walls with an air lock door (door clear space door). Having an inefficient fridge isn't a big deal when things are going well but a heat wave in summer will overwhelm you quickly.
Lastly your trap entrance - while it looks pretty good its generally a good idea to lay traps in a chequerboard pattern - this allows colonists to pass the traps without walking over them thus preventing accidents.
There is more but I don't want to go to far...
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