Here's a thread I put up regarding the univolt replacement I did. http://www.airforums.com/forums/f37/trying-not-to-screw-up-100751.html
You can also do a search for "univolt" and be overwhelmed with a lot of really helpful information.
I'm very happy with the PD 9245. I'd replace the univolt and either rebuild the existing fuse box or get a new one. I rebuilt mine and now I'm going to pull it and install a new blade style fuse panel. Check the outlets to make sure everything is snug. Also there is a circuit breaker box for the 120 close to the univolt that should be checked out before plugging into shore power. You're wise to proceed with caution.
I think I have an electrical diagram somewhere. If I find it I'll send it along.
As to the Panorama windows, I think you'll have to look at making them out of Lexan. They're not made anymore and finding used ones apparently is pretty close to impossible.