Anson & Howe wore very, very, similar camouflage patterns when new, so starting from an Atlas Anson would save you a major paint job! Howe had an aft control position wrapped around the forward part of the second funnel, so you will have to fabricate that.
Atlas had originally intended to release Anson as their first KGV and at half price too. At the last minute they substituted POW and all their pre-production advertising was wrong. As soon as the range was launched, Atlas came under pressure to upgrade the models that had the join between the MAZAK hull and and plastic upper hull and superstructure and to improve the plastic details and Anson was moved down the production pecking order to emerge with a full metal hull much later in the series.
The original HMS Hood had the break between metal and plastic at the waterline but Bismarck & POW had it above the external armour belt and, sadly, KGV was based on the POW tooling. After Hood and Bismarck were released, Atlas ordered a Neptun POW from a famous model shop chain in the UK to see where they were going wrong and DOY and Anson were much, much better models with full metal hulls.
Hood is the easiest to waterline. The plastic upper hull is joggled inside the metal lower hull and attached with superglue. Usually, it is easy to insert a stanley knife at the bow and use a junior hacksaw to cut the plastic joggle off and work your way to the stern. Use a sanding block to level up the plastic waterline and touch up th paint. It is the same for Bismarck, POW and KGV but you need to cut out a piece of plastic card to provide a true waterline (do not forget to fit the external armour belt as appropriate).
The stand is screwed into the hull with bolts and should be easy to remove but the stand provides a useful handle when sawing the hull at the waterline. Saw around the stand bolts and tackle the removal of the bolts and stand before sawing through the metal bolt hole studs. Often the bolts have added superglue to save tapping the studs so use a beefy screwdriver. Happy modelling!