rainwater tank pvc or stainless steel

You can encroach on the 900mm. In NSW you can go up to the fence if it is <1800mm tall, if it is over 1800mm tall you need 450mm setback, you only need about 450mm to shimmy around but you need about 800mm for a wheelbarrow if that is your only rear yard access.

Yes, you need to do that.

Thin tanks are more expensive than the equivalent same capacity poly round tank but cheaper than a steel tank.

A few hints.

PUMP:
Don't be talked into buying a large, expensive pump. A toilet cistern fills at a maximum 6 lpm.

If connecting to a garden tap, make sure they use a large internal diameter hose to reduce friction (flow rate) losses.

Using a 18mm garden hose fitted with a short length of 12mm garden hose to allow use of 12mm attachments will result in less friction loss. At 20 lpm, an 18mm garden hose has 8 times less friction loss than a 12mm garden hose!

Blue Stripe poly pipe is measured as an outside diameter and the most commonly used DN 25mm pressure rated version has an internal diameter of about 21mm. Using a suction hose with an internal diameter that is less than the pump's suction port's size to draw water from the tank to the pump is inefficient and will void most pumps warranties. Using a correct internal diameter, UV stabilised, corrugated, flexible hose is much better than using a stiff, smaller internal diameter, Blue Stripe poly hose.

Make sure the installer does not attach a 90 degree elbow to the pump's suction port. The suction hose should respect eight internal diameters of straight hose immediately before the suction port.

Make sure that the pump cover is well ventilated.

TANK:
Don't option the tank's outlet to be fitted at the bottom of the tank where the sediment layer obviously is.

Don't option the tank's inlet to be positioned up above the outlet that supplies the pump. You don't want waler falling into the tank at a height above the valve that supplies the pump as it can resuspend sediments and often result in the pump drawing air bubbles unless the tank is reasonably full.

Have a Rainharvesting brand Air Gap fitted to the overflow pipe so that the tank's overflow outlet's mesh, which restricts the tank's overflow capacity and which can also gum up, can be removed. This will reduce maintenance plus increase the tank's overflow capacity.

https://www.youtube.com/watch?v=XwHkvXK2YHU

AUTOMATIC MAINS WATER SWITCHING DEVICE:

The only one I recommend is the Acquasaver. It is hydraulically operated by the mains water pressure (no power required), is bullet proof and cheaper that the rubbish commonly used.

WATER QUALITY:
Using an ICON Leaf and Debris Controller will have superior results and better yield compared to using other leaf diverters.

FIRST FLUSH DIVERTER:
Never, ever allow a first flush diverter to be fitted at the top of a wet system's vertical riser at the tank. If it is, the first flush will only fill with the settled water retained in the vertical riser since the last rain event while the first flush will still be in the downpipe! A first flush diverter must be fitted to the downpipe when plumbing a wet (charged) system.

No...but a planned new website will have a diagram showing a standard installation and a diagram showing one installed to best practice. More than 20 endemic installation and optioning practices will be shown and readers asked to identify which ones are substandard. Heads up...all will be substandard!

I have identified and discussed numerous substandard practices in numerous threads I have answered on H1.

A system designed to best practice has better quality water, improved yield, require less maintenance and invariably will be cheaper.

Plumbers are not trained in fluid dynamics or rainwater harvesting best practice. At high flow rates, your pump will have low pressure zones around the impeller and possible cavitation.

The few issues I mentioned are explained as simply as possible.

Which ones would you like further explained with photos?

I doubt very, very much that you would find a 2,000 L stainless steel tank as narrow as a poly Thin Tank.

The poly Thin Tanks are robust, cheaper than stainless and are aesthetically pleasing. I wouldn't consider buying a more expensive stainless tank but your tastes will differ to mine.

Are you having a submersible pump or an external pump?

If the submersible pump draws water from the bottom, make sure the plumber places it on a perforated ledge so it doesn't vacuum the tank's floor, sending dirty water to the end fixture.
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Above is a submersible pump that draws water from the bottom.
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Above is the result of a submersible pump vacuuming the tank's floor.

and do you agree with my points regarding upgrade for the space saving options to go with thintank or kinhspan steel tank. i get 200-230mm extra space if i go with this upgrades from builder default poly 700mm wide.