I don't know FreeCAD specifically, but #2 SHOULD be very hard. You do not want to rotate the part, you want to draw the sketch on an already slanted plane. Your

I don't know FreeCAD specifically, but #2 SHOULD be very hard. You do not want to rotate the part, you want to draw the sketch on an already slanted plane. Your sketch (and resulting solid) should be agnostic to reference plane orientation, otherwise the whole parametric model becomes "spaghetti code"