From what I understand of your modifications, it is unlikely that your Landrover could be used on the road in Australia.  Despite the fact that all states are supposed to have the same standards, the method of implementation and the interpretation of them varies from state to state. 
But in general, the problems you are likely to find is that there are specific maximum lifts and tyre size increases, which cannot be exceeded either in any circumstances or I think in some states can be exceeded by undertaking very expensive testing.  Most states are very tough on the methods used to modify steering and suspension. For example, wheel spacers and adapters are illegal in most if not all states, no discussion, and there are similar blanket bans on some other modifications.
I doubt that the side exhaust is legal in any state, although you may get away with it with open bodywork and only front seats. Assuming it is a turbo diesel, noise is likely to be within limits.
Emissions are likely to be less of a problem than in the UK. Although in theory the engine must be certified as ADR compliant, this will not be checked after initial registration unless someone complains. (at worst you may have to return it to standard for the inspection and then refit the modifications)
The procedure is generally that for a non-standard vehicle, all modifications (and variations from vehicles with Australian approval) will have to be inspected by an approved engineer (at your expense) and any rectifications he demands carried out. A study of the relevant government website (domain will be <agency>.<state abbreviation>.gov.au - e.g. rta.nsw.gov.au) would clarify the requirements and procedures, although they are full of rather vague cross references and some of the websites are pretty hard to follow.
Note that approval and registration in one state does not carry over to another state - if you change states you have to do it all again in general, so you need to bring it in in the state you plan to live, which means there is little choice of port. 
I am sure some who have brought in cars will have specific details about importing, but I seem to have heard of major problems with cleaning of vehicles from the UK - there are serious quarantine concerns about getting even small traces of soil from the UK because of the desire to keep Australia free from foot and mouth disease.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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