CVF has a bulbous bow although the amx speed for the beast is only 26 knots.
The main thing that will delay the build of the ship is that pretty much no production information (eg production drawings such as lofting plans, shell expansions, unit build assemblies etc) has yet been generated. Recent ship procurements LPD, Astute and to a lesser degree T45 have suffered heavily for this. What we appear to have for the £300M+ invested so far is a set of general arrangement drawings, some very detailed "studies" and (I believe) a worked up power generation & distribution system.
Once the production information has been generated, she will actually be relatively simple to build as large parts of the ship are suited to panel lines (ie they're flat). Trouble is Mssrs Harland & Wolff have flattened theirs, Mr Swan Hunter has just gone down the pan which leaves a very limited steel fabrication capability.
The ship could be built that quickly, provided that :
a. MoD gets a move on
b. The detail design of the vessel is progressed asap
c. We throw the right manpower at it.