The centre simply take a photocopy anyway, so I'm guessing the copy SHOULD suffice. I have always had the original though, so I can't be 100% sure.
I have never been to MacGregor. I know that Woodridge have a rep for being the easiest to pass.. and the people are quite familiar with imports... many other places have no idea what they're looking for.
In QLD you don't need a weighbridge ticket, but yes, you will need to apply for CTP from say suncorp or RACQ BEFORE you go to QLD transport.
Also you will need a current Safety Certificate...
If you have the safety cert and CTP and the registration application form FULLY filled out, you can drive the car to the inspection centre... but only directly there. You will need to rego the car the SAME day as the CTP is written... I know with suncorp, you can change the original once only, then you need to cancel that CTP form, and get another one. (You will get a refund for the cancelled one, but it just takes time.)
Do you have the safety cert/ organised CTP yet?