During the drawing process some of the iso's get on different planes. I get that. My question Is, some of the objects, when selected in 2D to place on a plane, have different reference planes, some are on the bottom some are in the middle. They align alright but some are above and below if the reference plane is through the middle. Am I creating the extrudes wrong or what? How do you get the ref planes to be, for example, on the bottom?