Yes we are replacing treated pine with a hardwood this time but I just want to make the right choice. Still it's nice to hear you are happy with it . Anything will be a big improvement I do like the idea of an Australian hardwood that is from sustainable sources though . I gather it's been down a few yrs and you haven't experienced the shrinkage someone else complained of ? Thanks for the feedback . This site is great :)

Try BBQ's Galore. I don't think they sell them anymore but they should know the supplier. Ours are extremely comfortable.

The design is called Chesterfield, very common. Where are you based as i know of a Place in Dandenong Melbourne

The doors cut in half are called ' Dutch doors'. An Australian company called ' doors plus' sell a door that is called guardian 2 in 1. This door allows part of the door to be opened with a security mesh insert. This would allow the air flow, but keep unwanted bugs and people out. https://www.doorsplus.com.au/doorsolutions/external/external-guardian-2in1/