Solatubes are a good solution where structure doesn't allow for skylights.

I understand going with the grey since it is an 80's style house. You could also do bright bold colors. I do not know if that is your style. I have attached a quick rendering of the gray scheme you mentioned. I prefer light colors above dark colors. This keeps in theme with the sky and earth. Makes the house seem more grounded. The dark entry also draws your eye to it especially with the light coming from the other side of the house. I have also attached a quick rendering of a blue scheme. It looks like you are on a beach and I thought this would blend in with the surroundings. If that is what you are seeking. Hope this helps.

These houses were designed to look good from the street, regardless of what the orientation was for the Sun. Everything depends on your budget and how far your prepared to go. A friend's house in Queenstown faced the street, the toilet and bathroom had the best view of the lake and the Sun. They got a house removal Coy in, jacked it up put it on the truck drove out and turned it around and reconnected all the services. It then faced the North and West great views and warmth, doubled its value in 3 days!. I replaced my storage water cylinder with a outside gas one, picked up enormous space in our laundry. Another tip is to draw up your "dream" plan, then overlay it over the existing and see what you can really do, your then not influenced by what is already there, and often get a much better insight and removed from the existing. Good luck, its very rewarding and make it fun!

Thanks for your comments everyone. We've taken your advice (Luke and NH) and changed the island to a rectangle (1200 x 3000). We lose one breakfast bar seat but gain storage and dining room space plus it shortens the distances from the island to the cooktops. It also removes the need for a corner carousel. We're much happier with this result. Dairy_maid, we've done what you suggested and walked through some common tasks. Overall it works reasonably well although we may keep some coffee spoons and butter knives in the scullery drawers for morning toast and coffee. We've also invested in a "silent" rangehood which has the motor on the outside of the house behind the fridge and we've upgraded the scullery sink to one that is 600 x 400 (internal size). Fabrication starts tomorrow. Woohoo. Once again, thanks so much for taking the time to respond. The design has been significantly improved with your input.