I had a big interior re-do done by Beegles in Greeley, Colorado in 2012. At the time, my 180 had an original 1980 Cessna interior. I was looking for a lighter, updated, functional interior.
Beegles ripped all the old stuff out, stripped all the adhesive off the inside, repainted the metal, and glued Selkirk foam to the inside. We didn't install the panels. They also installed an AirTex headliner and laid the coin-style flooring material. I also had them remove the hat rack so I have an extended baggage area, but we didn't move the battery to the firewall so it isn't flat back there like some other 180s. I haven't had any issues with cold or noise related to the minimalistic interior. I use ANR headsets and I dress to egress.
They also removed the speaker and installed the Precise Flow vents from Sportys, BAS harnesses, and door stewards. I also have the inertial seat lock mod under the pilot seat, but that might have been done previous to this work. I opted to keep the stock overhead light unit. They replaced the aft window glass while everything was torn apart. Finally, we mounted a fire extinguisher on the floor between the forward seats aft of the fuel selector valve.
As far as seats, we shipped them out to an interior shop for rebuild and recover (MJ Aircraft in Anderson, Indiana). I kept the stock rear seats because my son was in a car seat at the time and I felt like the stock seats were better for a carseat than the folding seats. Now, I rarely fly with more than one other person so I leave the rear seats out. Installing the LakeVue or Atlee folding seats is on my wish list.
For cargo restraint, I had two nets made. One is a vertical net that is at the front of the extended baggage compartment. That's pretty standard. The other net has eight attach points and lays flat on the floor. Four of the attach points are to the seat rails using Atlee's Cessna Seat Track tie downs. The other four attach points are the four seat belt attach points for the middle (3d and 4th) seats and aft (5th and 6th) seats. That net works fine, but it isn't the best set up if you plan to use the back seats. The nets were made by Mountain Wave aviation.
Overall, I've been pleased with the interior. It's held up well for 12 years and 1150 hours. That said, I don't haul a lot of stuff back there, and what I do haul is typically soft-sided bags or plastic containers with rounded corners. If I had to do it over again, I might have installed vertical cargo net attach points behind both rows of seats so I could put a vertical net behind the last row of occupied seats.
Good luck with your project! I can get some pictures if you want them.