What are you going on about? Chinook should fit in the hanger, even if the Rotors have to be removed and the MRH-90's are all marinised. Byond that, i'm not sure exactly what you are trying to say, you arent being all that clear.
I mean 160 or 170 mts is the length of the line mts of the hanger and the light load space, from one lift to other. So i would put the chinooks next to the back lift, and next to the fore lift the tigers and uavs, the middle part for the cargo, chinooks maintenance or more tigers.
Money for that sort of design work would be tiny compared to the cost of the ships themselves, not really an issue. CEAPAR/AUSPAR would be mounted higher then SPY-1D, but would likely be MUCH lighter.
The money and the piping, cabling, compatibilities, the ships has many systems, for example the magnetic firm stealth net ( which needs a studied balance..), the system for cooling the hull and superestructure and all the normals. A diffiicult for finding the most possible common "commonwealth" ship. All this proportional, but the superstructure and heavy things are in another level of effort, possible of course, but it would be more a different ship than a derivate ship.
Ikara was removed from all RAN ships by mid 1991. RN removed it from its ships during the late 1980's. Neither navy has introduced a replacement, that says enough in my opinion.
Please, we can imagine a fleet of subs attacking austrilian interest or assets, recall mentions in australian media or magazines to the growing chinese subs fleets, well, for example the 10 awd´s and new anzacs versus 20 x-nation subs, ballroomm dancing, like we send our surface assets for the hunt of the hostile subs, and there is bad sea or risky to send the helo so we are left we the ships torpedos, which are limited and slower than asroc type, the combination with apowerful hull sonnar gives a longer perimert for the hostile sub, it is not the same to localize a zone where probably there is the hostile sub, because of row of hostile torpedos coming and signal from the hull sonnar of the ship, once you localize you can launch a useless long range torpedo, that reaches the target zone later later than an asroc, not to mention to lauch 3 or 4 depths charges at the same time and 3 or 4 asrocs. And not necessarily an hostile fleet of 20 subs.
The combat system on the collins class submarine is derived from the Raytheon Combat system aboard the las angeles class, ohio class, sea wolf class and virginia class. At least from what i can get hold of from google.
Collins are 10-15 years old and the technology is top modern, like it will be the s80 in 10-15, still.