Is that drywall? Not cement board? With Redguard? (And some Hydroban?) Not going down under the tile? And you're not waterproofing the tub area?

The floor under the tub and shower has already been fiberglassed. The walls are cement board then the red stuff is waterproofing.

I think the big question is how you are handling the transition between the walls and floor in the shower area. The waterproofing has to go down the wall and over the pan for the proper drainage plane. How was the custom pan formed? And how did you handle the transition area?

Here is a picture of the fiberglass that was done. This picture is BEFORE we had to put in the platform for the tub. The plumber wanted us to put in the platform but neglected to tell us that from the start. We then re-fiberglassed the platform into the shower area.
Are you saying we should have fiberglassed the shower walls too??

My idea for this shower/tub combination came from this picture I found on the internet:

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Source: cococozy.com via Kristin on Pinterest

Here is the tub that I have purchased that will be put on the platform.

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Source: us.kohler.com via Kristin on Pinterest

Here are more progress pics. It's coming along. Hopefully 2 more days.

I love the design and it looks great so far - hope you will keep posting progress pictures!

Here is the latest pix. What do you guys think. I was worried about the marble saddles but I think they ended up working really well in the space. The tub and plumbing fixtures should be getting put in the last week of March.