Just two remarks about the 20mm mountings:
for the single mountings please use the new ones with the correct size instead of the grossly oversized old ones
the mountings on the aft superstructure should be power operated twins with a small cabin for the operator at the side. Instead you have used quadruple 0.5 inch machine gun mountings which have never been aboard the Howe.
I would love to replace them with better lookings and sizeable, but it seems to me, that I've got the last updated RN guns parts sheet. In that there are only these, so please provide me a link.
Regarding quad HMG or not, my sources (maritimequest is the one, the other which claim they were attached according the 1943-1944 refit, I can't find). The only real picture which shows the armament on the aft supestructure clear, they are covered with canvas. I've got a picture of a model which shows 0.5 quad there. The sources are not 100% but I have no reason to doubt on it. If you have some informations that says other and they are 100% valid I will gladly change to the power operated (20mm ?) twins