It all depends on your abilities with 3D programs Mate.
It is pretty simple if you have worked with 3D programs.
It can be a bear if not and you have to learn from scratch.
I'd suggest Misfit 3D for a free 3D modeling program.
You would export the Model with S3D.
Import to Misfit and edit the UV's in it.
It looks and sound hard until you do it a few times.
But it becomes very easy after a few WTF's?
PM me if you need further help.
I'm always wasteing time here at SubSim anyway.
And I'd rather you learn to do it then me doing it.