I, however, usually rotate the plan to give one face that is orthogonal. Copy it three times, rotating it by 90 degrees each time. Then rotate3d to give elevations in each direction. I do this because I prefer to work in plan view, and each elevation does not need to see the detail from the other faces.
When you rotate by reference, choose the base point at one end of a line, specify R for reference, specify the reference angle by choosing the first point again, then choose the other end of you line as the second point, then if you activate Ortho, when you have to choose the new angle, you can see the proper angle and merely click to choose that angle.