Add a disk and in select

points mode, select the points

shown (including the center

point) and delete them.

This leaves a nice round edge

which will become the

bevel around the tub.

Duplicate this object and

mirror the copy in the X

and Z axis. Align and place

the two objects as shown.

Join the two objects and add

an edge between the two

former objects also add two

points as shown

Add edges between the

object and the two new

points. Save the object.

Create an Open Path in

a round square shape like this

with the Start and End points

at the same location. The path

should be flat in Front and

Right views

Reload the edge object (if you

deleted it) and scale it to the size

you want, relative to the path size

Extrude the object along the

path with 'Align Y-Axis to

Path' selected. 60 sections

worked well for this example

After extruding, you should have an object similar to the one above. For a proper object,

find the duplicate points where the Start and End of the path were - merge these points together

to eliminate one set of them. Also, depending on your scene, you may need to select and scale

the points in the bottom of the tub together to close the bottom opening.

  Copy the tub object and

move the copy to the side of

the original, then join them

into one object

  In add faces mode, add faces to sew the two tubs together

 Your final object should look like the one above.

Texture and scale

to your liking