@alan fraser said:
AS Cotty says, the pdf is password protected, so we can't see the actual dimensions. Looking at the jpg, the tub could either be round, oval or egg-shaped. I've taken the hardest option...egg-shaped and started with a sphere, constructed from circles of of 48 segments. There is also a parametric shapes plugin that will make such a sphere directly.
I've then cut the top off the sphere and used CP Philips's Sketchy FFD (3x3) together with the Scale tool to make the dip in the middle section...by scaling-down the middle of the 3 sets of control points. Obviously, you'll need to install this plugin and learn how to use it. It's pretty easy.
I then used FFD (FreeForm Deformation) again on the 2x2 setting to narrow one end to make the egg shape, before scaling the whole model slightly narrower into more of a bath shape.
I used Fredo's Joint Push Pull to give the whole thing some thickness.
Wow, the result is amazing. Most of your explanation sounds like gibberish to me, hopefully with time I'll learn all this stuff.
I attached the spec sheet with the exact dimensions. Please let me know what tool/plugin I can use to modify the existing model you sent (it seems that the "curves" that form the contour of the bathtub are more defined. i.e. they curve a little lower one on side, and a little higher on the other).