The semi clear shrink wrap can be installed by professional installers. Ask around the marina or check with other boating sources in your area. If you are in a northern boating area, there will be several contractors capable. You can have them build the frame or you can build it. I'd have them build it the first year, save the materials and then rebuild it yourself the next years.
The semi clear shrinkwrap acts as a greenhouse to trap solar heat. It can get to 70* on a sunny day in winter. It also is the best way to keep snow and ice from piling up.
Consider adding fiberglass insulation over the deck inside the tent if it's a really cold area you're in.