Paul......just my twopence worth
P 113844 Elevation View
F/R is a reference line created where the waterline intersects the hull, it also projects upwards where this line meets [the deck?] and from there a dimension FWD to the extremity of the deck
P 113843 plan view
F/R also referenced the axis or centre of the pod...however this pod in the real vessel is partially outboard of the footprint of the deck....the position of the pods in the photograph is also approx. the length of 5 people or say 25'........
It is nearly as though the End Elevation and Elevation plans do not show the actual deck level....they have a hide
selling such incomplete plans....[possibly drawn by a 1st year apprentice or the Tea Lady
]
The only reference to the foot print extremity of the deck is shown in the plan view
There are masses of images of Illustrious in Google........and all provide a much better perspective of the final build
I would be inclined to build from the photographic images, as your GRP model is only another persons interpretation of ???...
Take a plastic lamination image of one of the references that you base your build and if anyone questions your model......you simply say ...here she is in B&W
Keep us posted....... Derek