Hi there! Is this photo from Houzz? If so, you can ask a question directly on the photo and the professional who has uploaded it will get notified and hopefully be able to give you some answers :)

I would relocate door and entry to be beside bedroom wall and maybe add a wall to define the spaces. The 'new' entry area could be made into a nice area without being too big. It could be 1200 wide and 1560 long, just enough to circulate guests into the house without walking directly into the middle of room. Certainly not a cheap or easy option but it would be the best outcome overall. It will completely change the dynamics of the whole area! I don't think that any furniture layout will be a clear winner as they'll always be a compromise, even though the options as shown above are very very good.

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.

think about fencing some hard floored area with a simple baby gate (available on kmart, target, bigW and on line) ...if he has his favourite bed and toys in the temporary goal, combined with strict regular training and walks he will eventually get the message but you must always respond positively when he does and make a restricted space so accidents only happen in a restricted area...i know our dogs are special but they're quite happy in a small space all day as long as they know they can expect your attention and a walk when you arrive home or, weather permitting, a morning walk is even better and they can sleep all day...I was never happy to allow my dog to be left outside alone as they can have injuries (especially if you have tempting rodents to chase) and a special dog like Mace might be tempting to a thief..keep him inside unless you're outside with him