SIP panels that I researched are for walls and roofs----hard foam sandwiched between two sheets of OSB. Openings can be made for conventional windows/doors and even skylights-----but nothing like in those pictures.

Please let me know what you find out! I'm looking into a dining room addition that will also serve as access to the back yard.
I've requested info from various 4 season room companies and hope to find something soon!

Stay away from pre-fabricated sunrooms. I paid $54k for a 12 x 12 Joyce Manufacturing pre-fab sunroom. Alot of their marketing is false, they promote heavy use of vinyl and the only vinyl is the windows. There are a ridiculous amount of design issues with them. Heavy use of aluminum and aluminum skinned walls. Aluminum conducts cold and heat. This room, even with low-e windows and foam walls and foam advertised elsewhere, is so much colder than brick and wood, and vinyl sided and wood three seasons rooms I had in two previous homes. And their walls and roofs were not insulated.

There are a ridiculous number of gaps created by the nature of the unit. Picture vertical supports made of aluminum with horizontal supports going over them. They horizontal pieces go over them - they don't lay flat. Everywhere that happens, cold air comes in.

Joyce advertises low-e windows, but they don't say you've got to shove in weatherstripping along the window track because of all the cold air you can feel flowing up and in. I've spent hours and hours putting weatherstripping in all of the gaps.

The installers also had to come back and rehang the exterior door three times. It hangs slightly crooked and lets cold air in. Before the 3rd time they came back, you could see daylight thru the top of the door.

Pre-fabricated is a big, expensive regret. never again.