Great progress so far. I only have two points to make;
I've looked through my sources here, including Friedman's 'British Carrier Aviation' and I'm 99.9% sure that the flightdeck does not slope downwards towards the bow. From photos it appears that the forward portion is more rounded into the hull for aerodynamic flow and this might be the source of the optical illusion.
I've made new 5.5in guns for Hood much better than these which I attach here for your use.
Good deal on the guns, thanks. The 5.5's from the current RN weapons sheet seemed a bit large.
I believe you may be correct on the flightdeck forward. When I did it the only reason I could think of for it to be angled downward was that perhaps since it was essentially a contemporary with the early Furious, which did have the flight deck angled down, perhaps they had done the same with Hermes. I corrected that on the next version, so its level.