We have built boat enclosures for a variety of uses and functions. Some of these include shade, warmth or privacy. In summertime a screen enclosure for sun blockage is useful. For camping, a mix of canvas with screen windows turns your boat into a home on the water. You may add plastic windows which velcro on for warmth and visibility or canvas flaps which allow you privacy.
Partial enclosures in which one two or three sides of the boat are covered may be your choice rather than the complete enclosure.