Your plans seem expansive and maybe costly. Id spend just a bit more and get a proper professional plan done.

we wanted to insulate our verandah roof as well as allowing light through lazerlite panels so we lined under the verandah with corrugated zincaluume with blanket insulation and then put corrugated lazerlite under the lazerlite panels: a double layer of lazerlite and a neat ceiling and looks fabulous

Hi there Nick, looking at your photos you look like a modern hamptons family which is lovely, do you live in a warm climate. I did like the photo you posted of the open plan living and think that you are on the right track with interior colours I have marked out how I would like the first floor, I have moved the kitchen to the end wall to line up with BBQ outdoor kitchen, plumbing for this would have easy access via the garage below. The white tiles look lovely and hard wearing for the entrance foyer and Rumpus room, the stairs in timber due to the amount of traffic even continuing in up stairs foyer kitchen dining living, Carpet in bedrooms and downstairs theater. Kitchen in white but possibly Shaker style white doors these are very popular. Using existing sliding exterior doors if possible from kitchen.Dining to verandah, I think this ceiling would be best kept white to help reflect light back indoors, the tiles appear to be in good order but you might consider changing these along with new upstairs flooring Some where for a laundry shute would be handy, actually a Dumb Waiter so you could move the laundry with ease both up and down! The roof painted a soft colour, grey/white or off white, the verandah railing could be the same colour or you could do glass. The builder had a very different style of house to what I think you are wanting. Your photo

oklouise; it's 15 meters from the white vent pipe to the last post on the existing patio. Sorry if this wasn't clear. Not sure why so many questions re the use, how many steps there will be, landscaping or indeed the actual location as this is all planned, all I wanted to know is how best to connect roof to roof eg; through the fascia into the trusses. Yvonne, we looked at this idea but where we are there is always a sneeky little breeze and this would likely allow for too much airflow. In saying that, I guess some Perspex might fix that.... cheers Twos company, great job, I don't recall seeing ply used like this. Comes up nice. Know what you mean re the rainwater, thinking do I remove the existing house gutter all together in this section and put on a wider/deeper one off the front of the deck capable of catching the new runoff. how did you connect the skillion to the trusses or did you use some other method? Cheers