Greetings!
I’m a self taught sketchup-er. I’m struggling with a model of a fire place that is basically an egg shaped vessel that has an oval cut out for a viewing window and a square base. I’ve attached a couple pdf’s of what I have so far. I was able to cut an oval on one of my models but the cut out was not the size I needed. If anyone can guide me in the right direction I would greatly appreciate it.
Or you could make the egg first, scale a copy of it to create the thickness you want, then repeat creating the oval cylinder and Intersect faces again on the double skinned egg.
Use View/Face style/X-ray to see inside while you are working.