Hi I'd like to be able to generate 3D shapes like this in Tinkercad - especially with the grid, to allow for some really handy manipulations via the the "View in 3D" mode in Tinkercad. End game - showing younger kids the principles of sketching, and Orthographic representation. They'd use grid paper to represent the Front and Top views - that's why I'd like them to see the grid on the 3D model. For those who find it difficult to visualize what's in the attached image, I think Tinkercad holds lots of promise. The very end game is then to get them to take their sketches, and create in Tinkercad.
Grids on Sketches