I was going to offer to drop by and run through a few things as I thought your location said Carine. Cairns is a bit far though. :-p

Legally, if the GX has airbags they need to be retained. Sounds like the GX is a MY99/00.
Did you keep the front cross member? The turbo one has a scallop cut out to clear the up pipe. Control arms are the same. Is the GX FWD or AWD? Rear shocks are different between fwd and awd.