As others have pointed out, be very careful about gluing foam on the inside. I suspect that if you have a very good coating of zinc chromate prior to glue, you will be OK, but don't even consider gluing to bare metal. My 180 was SAR in Rifle and was built utilitarian and light (no interior, no paint, etc..). It had foam glued everywhere inside and the corrosion that had started was not pretty. I am certain left unchecked it would have been a bad deal...
If you carefully mind what you put in the plane, you can have light and be comfy, and good looking too.
Those seats look great! I had mine redone by an outfit in Mesa, and they removed all the springs, skirts, and Cessna stuffing as well. In the end they weighed less, felt nicer, and looked tons better. A great place to save weight, if you need interior work!
Take care, Rob
BTW, BW I ended up painting it. Weighed it up front, and weighed it after. Only other additions / subtractions were an antenna removal and new plastic strut cuffs to replace the rubber bushings that are no longer made. And of course all new rubber... all told it cost me 32#s. Given that we are light weights, and fly 2 up at a max, I would do it again... Polished is pretty though
All of us are given sh*t in life, the smart ones grow from it...the rest fling it at each other like monkeys.