Some notes:
- scrap the solar panels. They are tempting but will give you close to no power on the poles especially in winter. During the summer they are decently effective but once winter hits you will be glad if they give you like 250W of power. Better invest in more wind turbines combined with more batteries or build a chemfuel generator. You'll need to supply it with chemfuel which will be difficult but it also adds heat which is an upside.
- I also recommend having 1 or 2 backup batteries behind a switch. If a Zzzzzzt event hits and all your power is gone the plants in the hydroponics will die and you will starve.
- the double door from the cooking area to the outside is a nice touch but usually doesn't conserve heat too much. I personally stick to a single door. Check out this awesome video that explores how temperature work and how you can keep your room warm: https://youtu.be/RtPwe5hDGBM
- instead of having a free space between the hydroponics just put in more hydroponics. It's essentially wasted space because your colonists can walk over hydroponics. They will be slowed down but being able to grow more food will make it worth it. Also: consider growing some cotton to get cloth. It's quite useful.
- lastly just a general tip: check out the thread for the community sea ice challenge found in this forum. Maybe you'll find some more interesting lessons learned there.