How to create curved/ round faces for complex shapes

[626463]

Hi,

I've been working on a kind of badge, but I am stuck on how to create curved/ round faces  for complex shapes. 

For reference the picture down below is what I am trying to create with some addons. As you can see the diver has multiple curved surface, as well as the outer ring. The outer ring I've managed to achieve it with replace face. But I can't seem to figure out how to create the diver with those curved edges.Reference Image

I've added the file as far as I got. I hope some one could explain me so I can use it for further projects.

Thanks in advance. 

[TrippyLighting]

There's no need for addons.

The base can be done with simple solid modeling tools.

The diver can be done fairly easily with T-Splines.

[626463]

Thanks for your help, could you perhaps show little example that represent these actions?

Thanks

[TrippyLighting]

Yes. Will be later today though.

[626463]

Thank you, I will be looking forward.

[TrippyLighting]

Here's a screencast of how this can be approached. By no means is this the only way though:

https://youtu.be/9hWOnjOJdxk

[626463]

Thanks for this explanation, there is something I still can't work out. After the creation of the diver, I would like to place it back in the design. But I can't extrude or push/pull, combine the diver with the rest of the badge. The shape of the diver won't be cut out into the material.

EDIT

When I extrude the arm for example there are strange wobbles being added. I think this is a part of the problem, because 10cm is fine but you'll get strange wobbles, 20cm not I will get an error.

Is there a way to pull straight down with changing the original geometry?

I hope you could help me on this one as well.

Thanks in advance