I've always gone with hinged doors since I scared my clothes could get snagged on the runners (I'm probably being over cautious) and I like to be able to see all my clothes at once so I can figure out an outfit.

Personally no Georgian bars on the doors, but its personal preference. If its just the doors and no windows in the dining area it should look fine, and will have a complete clear view out?

We would advise it is completely dependant on the space and your requirements. Walk-in wardrobes look great if they are kept tidy, however a plus for having doors is that it can conceal any mess and give more protection for clothing. Another trend for walk-in wardrobes is to have smoked glass doors mixed with open elements this could also work with matt lacquered doors. Alternatively you could choose to have open elements for items such as bags, shoes or coats (things you know that are easy to keep tidy) then hinged doors for other modules.

I think slim line sliding doors look more modern and you'll get more view of your garden. We were going to have bifolds but have now decided on sliding doors. Our opening is 4m and planning to have 3 doors. As your opening is quite large, you could have 3 door and once they are opened, you will still get a good size opening. We're having 35mm profiles but I think you can get even thinner ones. Are you have a flat roof or pitched roof?