it going to based of the juan carlos amphibious assault ship which you got a licence for it has been slightly modifed to hold about a dozen [12] f35b's which is something the austrailian canberra class ship cant but it too is based of the juan carlos.
even thought it less than 30000 tonnes they are aircract carriers of that size in cervice.
the italian cavour displaced 27000 tonnes about the same as the juan carlos
and theres even smaller the mtms from thialand only dsiplaces about 11,500 tonnes
which is near enough the same displacement as the larger missile destroyers from south koreas which displaces in at 11000 tonnes