Architectural salvage yards are also a great source. Try the RE Store, Second Use, the Habitat for Humanity store, etc. Google Architectural Salvage for places near you. You might also try CraigsList.

A 3x3 shower is too big. Definitely less intimate. I like the second plan! What did you decide to do?

Actually, just reread a bunch of the tile places and they all say not to use in shower. Bummer - that's out. However would still love ideas on what to do around it and if anyone can think of a way to update the acrylic walls? Or maybe it won't be as bad with new fixtures/shower curtain in better lighting... fingers crossed... just trying to get ideas together.

Thanks very much for all your feedback. Just to answer a few queries - the deck is directly outside the main room so the new doors open out onto it. The doors won't be French - they're just the only doors that the 3D planner I'm using had, they'll actually be large stacking doors. I've had another idea too which would be a lot more expensive but offers a completely different approach. This is quite rushed so doesn't show accurate layout of kitchen or anything like that, basically just provides an idea. Thoughts!?