For the time being (and this IS only a temporary fix) try using a water based penetrating sealer on the grout. I stress water based, because solvent based sealers today are made to be "breatheable", meaning they allow moisture to transmit back and forth, while the water based sealers will repel water. You still need to address this in a more permanent manner (the glass door is a good idea, but it wouldn't hurt to remove the bathroom floor tile, waterproof the floor, and install a new tile floor), but this will help until you can afford to do what you need to do.

Hi. I think the overall look is good. Large tiles do make a room feel bigger as the pattern is less busy however I've seen the hex tiles in small bathrooms and they seem to work as your inspiration pic shows. I would probably lose the flowers though if I'm honest. Do you want the window for light or ventilation? Could a decent extractor be sufficient? I'm thinking that back ŵall could look quite busy. Is there any opportunity to change the layout? Moving soil pipes can be a little costly but could the sink be moved although ideally the loo would be hidden round the corner. You can pick up some great looking vintage or vintage style taps on ebay although unsure if the quality of the repro ones, If the layout can't be changed maybe have a corner loo and ŵall hung trough sink and put some storage in on the rhs as you come through the door depending on how you plan for the shower to open

Here's a modern design we built recently with glass backsplash. This was three different colors of Ann Sacks tiles.

my room is 42 square yards, want to divide it with folding doors to bring in light to room.want a unique door with glass.to give effect.i have a 2plus 2 plus snuggler suite in one room , dining table 6 chairs in another