We did the entire rear of a house on a cliff overlooking a river, and did the whole frameless / framed dance. No one would guarantee the long term noise and weather resistance. In the end, we opted to go with electric operated framed panels from Kaba Auto doors for both waterproofing and noise. If I recall correctly, because they were top hung and motorised, we were able to get up to 1.5m sliding panels with a 2m fixed panel across the rear of the house. We then built a drainage channel under the floor guide which drained into a channel grate installed just outside the door within the stone. The frame widths were only 40 ish mm from memory. Doors were awesome. You could run at them and they would be open before you got to them....

The Less Glass in your shower area the better - if you can avoid it. Eventually shower screens, no matter how effectively and often you clean them will deteriorate over time and shower signs of glass cancer. If the space allows it, effective planning can allow shower walls and other alternatives work effectively without the worry and hassle of cleaning glass. Thanks Paul

They look like steel doors but after a quick Google search nothing came up in Qld, only Melbourne and Sydney. I guess you'd already done this too hence your question. You could always order from interstate or maybe use aluminium instead. Maybe try a local heritage architect as they may have a local contact.

we need some photos or a plan showing the dimensions of the spaces and the width and height of each window and what are the walls made out of but do you want or need to be able to go through the doors to an outside patio or is it just that you want more ventilation?