Soon after they were constructed, both Dorsetshire and Norfolk received two quad .5� machine gun mounts. These were placed on raised platforms located just forward of the second funnel. As originally fitted these platforms were protected only with two-bar pipe railings, but blast from the 4� guns immediately below must have been an issue because, at some point, they were both raised higher and fitted with plated blast shields.
The only photo that I have been able to find that shows these platforms in any detail is this one, taken after the 1937 refit when the twin 4� mounts were fitted.

I have constructed the platforms just shown on the as-fitted plans. Each platform has two ready-use ammunition lockers along with the machine gun mount. The bridge between the two platforms is shown without railings on the plans and that is how I have built it, but I would not have wanted to walk across it. Common sense suggests that there would have been railings, at least on one side, and I may add some later. There are also brackets for W/T booms that need to be added just inboard of the platforms where the bridge widens out
Sorry for the lack of updates recently, but I have been doing a lot or traveling for work lately and have not been able to do as much on Dorsetshire as I would have liked. Hopefully, I can get a in little more modeling time in the coming weeks.