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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.

I do a thorough job weekly, but my partner has way higher standards of cleanliness and I do find him washing the sink and cleaning the shower doors on a daily basis. If he wants to do that, I don't complain about it. :)

If you look at your inspiration picture , the door there is a similar tone to your timber , the stone is similar , the charoal trim and windows are similar . The render is lighter than Self Destruct , and appears to have an 'effect' so it looks aged and rustic . So personally I'd go lighter , but also ask your contractor if they can do the subtle rustic effect , using two slightly different tones of render , and some water and brushes .