indegenous effort will take more time and wont probably produce something as good...
look at LCA....
obviously new tech has become available...and that may be incorporated
though i believe that yours may be a good idea but here i disagree with you. i think what you are comparing is wrong.
india started designing, building and operating indigenous war ships decades back. some are now retiring too. lca has just got ioc recently. whereas we have tremendous capability is ship designing and building. we have started buidling shivalik class ships now.
IN is a builders navy since long. so you should not compare our warships with lca.
lca is designed by ADA (DRDO). on the contrary, our ships are being designed by directorate of naval design, governed by indian navy itself.
on the other hand, directorate of naval design has already generated design of some ships now whose construction is not even started yet. our shipyards are full of orders. directorate of naval design has enough time to design our own carrier iac2 or 3. time is no matter.
directorate of naval design is designing really good stuff which is much cheaper costwise still at par in quality with other warships in the world.
why to pay much more for the work which you can do by your own?
suppose we have purchased these designs and blueprints now. where will you build a carrier? in which shipyard? india do not have any shipyard which can build that big ship except cochi shipyard which is building iac1 at present.
one more thing, do we really need 80k carrier. i thin 50-60k is more than enough to fulfill our needs.
please keep distance between what you need and what you want.
imho, directorate of naval design does have enough skills to design ships and carrier now. and they are doing best.