The CCTV solution is nice technological fix but why not avoid the inevitable issue of your box gutter failing and redesign the roof? Without having the plans, elevations and levels I would suggest that falling the roof away from the viewer in your image would allow you to collect the roof water on the (western??) side. There are ways to hide a gutter without hiding it inside your building and I personally think that one or two elegantly detailed downpipes can add to the quality of a building, why hide the obvious need to get water off a roof? Also, I would be very surprised if your architect doesn't already have a solution to this, it is a basic requirement of design.

Either are ok. But they both may require maintenance being timber. What about a Fibro Cement product or Colorbond. Depends on the colour and style your chasing as well.

Hi bigreader. It's not the tiles in the niche that are the problem. In fact, one piece of tile (30 x 60) will fit perfectly with no grout lines. It's the wall tiles around the niche space that will not line up with the side edges of the niche

The size of floor tile: 300 x 300 mm and the size of wall tile: 300 x 600mm The floor tile and wall tile do not align at all. It looks unprofessional. Should the tiler redo the job? Thanks for your advice.