Any way you cut it, I can't see it being cheap. There are inside skins, outside skins, electric, ribs, etc. Plus, I doubt highly I would even venture to a dealer for something like that. My first choice would be the factory. I would guess $3000 to have an aftermarket dome put in. I would question how well an after the fact would stay sealed, knowing that even the factory installed units leak.
I come up with that price based on a recent interaction with the factory on a request for swapping out a 13.5k unit to a 15k unit. I figure they average $600 for the A/C units which meant that the factory wanted about $1k to put it in (if I picked up the 31 footer I was looking at). There it was a pretty even swap out, with little to no modifications to the roof, compared to what you are talking about.
I'd shoot the factory a question on it and give them your VIN. It may take a few weeks to get a quote, but at least you'll know and you'll also know it would be done as right as it can be....
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