Ok to add to this YES you can AW KM ships bith H39 and H44 can be AW'd however just like the lower tier RN BB's you will not be able to use the common or at level guns.
How do I know this? Simple I AW'd a H44 and put the Opro II tripple 14.95's on each slot, I was now a hybrid of Monty and KGV. However I had to make alot of drastic changes and this was done on the test server back when I was testing France.
1. had to remove AA guns
2.had extra displacment to spare(No T guns or Sailors)
3.Had very low speeds similar to a Arizona back in 08.
But the Pro's were good in my opinion.
1. Near BB4 range (light shells)
2. Low gun abblity needed to blockshot
3. High firepower with x4 Tripple 14.95's
But then take into consideration this, Most KM players choose speed and enginers over reps, meaning the average KM setup usually involves more engineer's then repairmen. This is vise versa for RN. Another feature is most RN AW's are only 2 gun setup that are either tripple or quads. KM only has 2 sets of tripples in the BB line one for Opro II and one for Kaser. So the damage is reduce compared to RN.
In the end RN plays the oppiate of KM, RN is slow armoed and strong firepower, KM Fast quick shooting and elusive. Your not forced to play theses ways its just more os using your nations perks to your advantage, and people do.
-Fox