Yes the combination of dust and fat being vented into the ceiling cavity can turn into napalm in the event of a pot fire.
bfginger: Yeah the serious acoustic insulation will be out of our price range I'm sure. Possibly for our media room, I remember last year seeing a few YouTube videos a year ago about how an extra wall inside the room with double drywall and studs being further apart really helps with reducing sound transmission.
The idea is to use a bracket to put an empty space between the wall and the gib then have double layer gib with a sound absorbing material between the layers. That does take space away from the room, and just 13mm noise reducing gib would be enough gib for many people's AV rooms.
It's great to know there's condensation channels now. It being dumped onto the sills is something I really want to avoid yes. I'd read that UPVC reduced heat loss by 40% and Low-E coating with Argon gas reduced heat loss by 20-30%, but without remembering what they're comparing it to they're pretty meaningless, and it sounds like it might not be too noticeable?
The 40% figure is versus solid aluminium with plain glass. Low e glass is a moving target as different glasses perform differently. Make sure double glazing in thermally broken aluminium has a thermal spacer like XCel does or else there's a thermal bridge between the inside and outside.
With a good quality stainless steel benchtop you can put hotter things on it without risking damage than most other bench types.
You can have colours or art and photo prints inside of a glass splashback. I've haven't seen splashback grout dirt problems so the type of grout may be an influence.