I made a map of a 4D planet out of wood. More precisely, I made an outline of such a map. Here is a video of it. https://www.youtube.com/watch?v=X_j8ry3IQLY
It's a sinusoidal projection. https://en.wikipedia.org/wiki/Sinusoidal_projection
Right now I'm in Bali, which might have the best and cheapest wood carvers in the world. I think I will get one to carve out the map outline to expose the continents "inside" so that it will be a real map.