draw the basic ellipse, make a plan to the distance desired by the ellipse sketch plane, on this floor make a sketch with only one point in the ellipse center.
suploft between the point and the sketch ellipse.
during the execution of the loft command, go into the conditions window and put:
top point of the ellipse =tangent
sketch of the ellipse= tangent on the floor.
then adjust the thicknesses of both settings to the desired result.
