Sketch on plane and copy it to the reverse side?

I’m currently sketching out the layout for the front of the case I’m making and I need to see how that corresponds to the internals. Is there any way of seeing my sketch through the wall so to speak?

You can make the wall temporarily semi-transparent.

Is that using the materials menu? Don’t think I can access that in standard mode

Yes, I’m using the color component section of the Visualization menu.