As you all no doubt have discovered, especially those with bengals which are from the larger side of the median average (5kg and over and just pure muscle!) They require a lot of play and activity options. Cat wheels are perfor this, as has been repeatedly shown, lol, trouble is I have been unable to find anyone in Australia who manufacturers them or anything! And the shipping etc charges from direct uk purchase are very inhibiting, especially on top of the price of the wheel itself.
Self building is also out of the option as lack the needed transport etc to get the materials and tools necessary.

So any suggestions on trees, indoor cat 'climbing things/ adventure playgrounds ' cat wheels and what have you that are available in Australia, that utilise floor to ceiling space more than floor space greatly appreciated!

You are truly in a pickle. My Google search resulted in not finding much of anything unless you go with something that you find under "classifieds." Hard to believe there are no retailers down there selling cat trees or cat wheels. We do have some Aussies that post, so maybe they can point you in the right direction. Even your Amazon has nothing.

http://www.bengalsaustralia.com.au/cat-wheels/

It looks like Bengals Australia has cat wheels - not too badly priced at $380.
Trees you can get at most large pet stores. I got a cheap one on-line which is 6 foot tall and was sturdy enough for the boys when they were younger. They're both >6kg now, but still haven't had any trouble. I suspect it won't last too long, but we've had it for over 6 months and it's still going strong. I figured I could buy 5 of these cheaper ones for the price of one normal priced one and still come out in front.
It's similar to this one, but with a sturdier base and a second perch instead of the top hammock.

https://www.mydeal.com.au/soft-plush-ca ... gJKLPD_BwE

This may be something to consider:

https://www.hicat.co.uk/

_________________
The little monsters 3

All you can do is keep searching. New things come online daily. Things are much cheaper is made in Australia and not imported over all that water that surrounds you.

We have a cat tree exactly like the one in your link. It is okay but Quasar really prefers another one we have that is shorter and has 3 levels on it. I think he prefers the other one because it is covered in carpet not faux fur. If I could change one thing about the one in your link is to switch the covering from faux fur to carpet.

_________________
~ Kyenta

All of our three cat trees have carpet (and sisal rope for the support legs). And the cats love and use all three of them. I just want to know HOW a cat knows the cat tree is for them. They probably realize a human could not possibly utilize a cat tree and they are much to comfy for a cat to give them up. There are so many on the market -- at various prices. It does get difficult to choose what you kitty might like.

These guys have some amazing creations and ship worldwide

https://www.catastrophicreations.com/

I'd love to get some bridges and things made by this lot.

Everything on that website looks like FUN for the kitties. Wish I had the wall space for some of that.