I’m very new to Sketchup. My apologies if this is an elementary question.

Suppose I model a simple dinghy: 2 sides, bottom and stern, along with all the resultant compound curves. I now want to unzip the intersections and unfold the model in order to cut the 2-d shapes out of plywood.

Or in reverse. Suppose I model all the 2-d plywood shapes needed to make my dinghy and then wish to join the edges together to model the resulting 3-d shape. How would I go about doing this?

All advice gratefully received.