I totally agree, the ship has not a good opertational space,instead it's got all these sub sections for weapons and so on. The ship should probably have more deck,more like a Tarawa class.There one real good thing about usa navy and marines,they really know how design a ship.
Actually I am pretty impressed with the BPE and think it is the correct option for Australia. The segregation of the hanger deck appears to be intended as part of the damage control arrangements. The lower vehicle deck has to be divided up or you run the risk of having an
MV Estonia type incident. The stockholm rules for commercial RO-RO ships were adopted for precislely this reason.
For their size and crewing levels these appear to be very capable vessels. The
Wasp class vessel is a third as big again but can only carry an additional 400 troops over the BPE and has a crew of about 1300 compared to the 270 on the BPE. For a navy like the RAN crew size is a significant issue. According to Naval technolgy the vessel will carry 8 to 10 VSTOL aircraft and helos but I understand its capacity in this regards is bigger than the BPE as would be expected.
http://www.naval-technology.com/projects/wasp/
The BPE can take much the same weapons as the Wasp being desinged to take ESSM, CIWS and 20 to 25mm guns. The
Wasp appears is faster than the BPE with the latter having a stated speed of 21 knots. As you noted the
Wasp has a bigger deck space being just over 20m longer in LOA but in so far as effective flight deck length is concerned is is probably in the order of 40m due to the stern arrangment on the BPE. Despite this the BPE can launch 6 NH-90 size helos or 4 CH47 simultanously.
Finally there is the cost ..... for the capability it provides the BPE is signficantly cheaper than the
Wasp both to purchase and to operate (the latter is significantly effected by crew size). The BPE is fitted wiht an electric drive system using podded propulsion which is ahead of the in service
Wasp class and provides additional efficiencies. This is not to say the USN are not addressing this isuse but the first hybrid electic drive system will not be in service on an LHD until LHD8
USS Makin Island, is commissioned in 2007.
The USN are very good at designing ships for thier purposes but htis does not always translate well to the needs of other Navies.