Colombamike,
I have closely based what I've drawn on the comments from that site you link to.
"5.25" or 4.5" Secondary Battery– Though the 5.25" were preferred, there were availability issues with the guns. Instead, the widely available 4.5" guns seem a more likely choice for Hood. It was also a more standard round (Queen Elizabeth class, Renown, carriers, etc.). Although a typical arrangement for large ships of that time was 20 guns (ten twin barreled turrets situated on the starboard and port sides in clusters of three forward and two aft), this would not have been the case for Hood. Due to her internal arrangements, she would likely have been outfitted with just 16 guns in four turrets. The exact location of these guns would depend on the extent of modifications being carried out and available space for gun machinery and magazine stowage.
In the case of Hood, we feel that it was unlikely for guns to have been installed in typical fore and aft clusters. This is because they would have obstructed the senior officer's cabins and baths if installed in standard fashion. If installed aft, they would either have to be individually situated and staggered (like Hood's actual final 4" guns were) or located somewhere else on the ship. If this were the case, the most likely place would be in banks of four per side on the forward Shelter Deck abreast the funnels and bridge.
I've outlined in bold the points made, most of those impressive looking artworks on that site are just that, artworks. Some are more plausible than others. When you consider the actual constraints posed its obvious that even a rebuild has its issues. I could put the hangar forwards but then it would seriously encroach on the space of the 4.5in turrets and as we have seen mounting them aft seems unlikely. There is not much room for a hangar anywhere else, it might be possible to squeeze one each side of the funnels but beam is tight and the rearward arcs of the 4.5in guns are blocked. Anyway post refit its unlikely Hood would have carried aircraft for long, perhaps a year.