making my first model in this program, having some trouble. got first two shapes to extrude, was able to apply a slanted draft to the second, now i'm trying to do the same(but facing opposite way) to the next shape in line but it won't let me... at one point I drew vertical lines and connected them(drawing the outline of my shape if it were extruded) and was able to extrude, but then could not draft... help please!