We have a 16ft Yetti that we use mainly for ice a bit camping also. A few creature comforts that we have gotten plenty of use out of...
With your jack knife sofa up front make sure the holes are far enough away from the front of the sofa that you can fish comfortably. Some companies put them to close and isnt near as nice to fish out of.
I'd have to dig to find the exact brand but glow in the dark hole sleeves with clear covers to save dropping a phone down or a kiddo stepping into the hole. Also nice to have the glow sleeve for when the rattle is going off in the middle of the night.
Another is some sort of fan to help move air, either a 12v fan that plugs into the wall so can run off battery or a ceiling unit wired into the generator.
Electric/drill auger helps to be much lighter and never have to deal with the fumes.
Little corner storage spot on the top bunk/bed areas along with a USB charger for phones and such. Place near the ceiling so you can keep the cords out of the way and should not hit when folding up for travel.
Depends on your system and how long you stay on the ice but wheel well covers can be nice also. Another quick trick is to toss in 4-6 4x4 blocks to drop the house onto which stops/helps it from freezing into the ice. Will make leaving much easier just lift it up then knock out the blocks for next time.
If you are in a really cold area might want to look into tank heaters as the warmer they are the better pressure you will get from the tanks.
A magnet on a rope for that situation when something falls in.... Hopefully never need it but better option that trying to snag something with a treble hook.
https://www.amazon.com/dp/B07MYC7R6S?psc=1&ref=ppx_yo2ov_dt_b_product_detailsMagnetic lure boards that are secured to the wall and can remove and place in plano boxes for fishing out of the portable.
https://www.goicerigs.com/store/p1/Full%C2%A0_Mag%C2%A0_Tack%C2%A0_System.htmlCatch cover quick disk system, these are nice and expandable can be used for cup holders also. Give you different options for day fishing or setting up rattle reels.
https://catchcover.com/quick-disc-bundle/On the topic of rattle reel these are awesome and can be set up with the catch cover disk system. And now would be the time to run the 12v wiring needed for the light.
https://northernlightsrattlereel.com/