To assist with harnessing the sea breeze suggest a beautiful long narrow feature window that follows either side of the pitch of the roof (which will let in a lovely sky view plus breeze), or just have the top triangle as a window. Understand the desire to have the small window there however in a room with big glass/window features, the small window looks like an after thought and is at the wrong scale.

If you are in New Zealand, I have often found great lights (and a big range) at Lighting Plus. When I was putting my house on the market I put three of these: http://www.lightingplus.co.nz/lighting/pendants/contemporary/jaga-bcopal-1light-pendant.html over my kitchen benchtop, and they looked just gorgeous. So gorgeous in fact, that I have already bought three new ones in advance for when I upgrade the kitchen lighting in my new house. They also have these : http://www.lightingplus.co.nz/lighting/pendants/contemporary/hudson25-whitegold-1lt-pendant.html or these: http://www.lightingplus.co.nz/lighting/pendants/contemporary/trumpet35-pendant-blackgold.html  if you like the look of the internal gold under the shade. There are also others similar. I have also found some great lights at : http://www.edenlighting.co.nz/collections/pendant-lights . All of these are very affordable. However if you want to go really high end, and you like NZ timber lights, you can't go past : https://www.davidtrubridge.com/collection/lighting/  Just my 2c. Enjoy.

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.

my suggestion would be to keep the new kitchen in proportion to the size and scale of the whole house so i prefer option 2 with cabinets only as high as the top of the window, tall narrow fridge (less than 80cm wide) next to the back door with wall mounted mw and wall cabinets all round, no tall cabinets, more counter on the fridge wall then stove, sink and dw along the window wall to make sure that there is counter on either side of the stove and sink and locations for a toaster, kettle and other appliances..but exact location of appliances depends on budget and sizes of all the cabinets you want to use.. but, if you plan to remove gas in future, why not start with electric appliances and best insulation ready to add solar power at a future date? ...eg check out the electric air sourced hot water heaters and consider an electric flame heater for the kitchen fireplace and save the gas heater for the hew rear living area although it may be possible to have one heater with hot air connected to the other rooms with an in roof ducting system and, if you have long term plans to alter the rear lean-to research options for renovating the whole house and then plan all the work in stages...eg i would have the new laundry/bathroom next to the refurbished bedroom (master suite?) and have the future new rear living area with the north aspect