hi
Seems you can make something ;)
Draw a rectangle
Draw a curve line
Make a Sweep Rectangle on the curve
= you have your curvated volume

Now Show points
Select points of the curve or the curve itself
and you can modify as you want the volume by the curve's points as long as you don't make any other operations on the volume or drow another thing!;)

It's not yet paradise :) So export it and import it if you want to transform it inside a big project after other drawings ;)

PS you must export "Rectangle" + curve (inside) + volume !
As you know the measure of the curve, you have just to align points on a straight line of this measure and your problem is resolved ;)