You have a lovely room and it will be worth the effort to take the time to locate the right furnishings. Try Pottery Barn for to get some ideas about stylish comfort. Some of their furniture is on sale now. With down-wrapped cushions and down throw pillows, it really is possible to be comfortable without resorting to a recliner! Also, if there is a Bassett Direct near you, it would be worthwhile to visit the store, as they provide complementary design services. We had a very good experience with a store here in Florida when we were refurnishing our second home in North Carolina. I took in the blueprints and the designer drew out possible furniture arrangments and did a marvelous job assisting us with our selections. All of the furniture can be customized by fabric and finish and shown to you on a monitor as modified. Here is a link that might be useful: Bassett Direct

For a diy, there are a large variety of trim pieces available at the hardware/home improvement center. Color matching might be an issue. Based on the photos, pvc.

What is the subfloor there now? What does the manufacturer allow for underlayment for their laminate?

The installation of any mortared product in the horizontal plane will not withstand freeze/thaw climates. The pavers themselves, though, is a concrete product so I don't know what you are asking. Fully thick interlocking pavers are from 2 3/8"-4" thick, there is stone available up to 2" thick, and porcelain tiles at 3/4" thick. All of these products could be installed as a "paver" system. Your existing porch detailing and materials would also influence your decision.