Im flying YVR-SYD-MEL-SYD-YVR on AC and QF in Y, on the same ticket and have a couple of questions that i hope you can help me with

im *Gold with AC, but no status with QF

1. Will i only have lounge access at YVR (MLL) and SYD ( KORU & Silver Kris)?
2. My baggage will be thru checked to my final destination both ways?
3. On my return portion (MEL-YVR) what will be my baggage allowance? Im guessing Qantas will not honor *G status and restrict me to 2 x 23kg checked baggage.
4. Considering Q.3 is correct, if i was to upgrade my MEL - SYD flight to J, would Qantas allow me to use theyre "Americas" business allowance and allow 3 x 32kg bags?