Nice work ther Mags. You could do the inscription eerily futuristic - "From WW2 aircraft.net" perhaps??!!
Anyway, here's the info on Staion 114, Hethel.
Although the written specifications I have state that there were 50 loop-type dispersal pans, the drawing, based on the Ministry of Works and War Ministry plans (as those agencies were then), actually show a mix of loop and 'frying pan' dispersals sites, the latter being in the majority. The aerial photos, source unknown, shows the airfield as it was in 1944 and 1947 (vertical shot) . Note that, as with many (but not all) airfields of the period, the runways had a layer of tar applied over the concrete, in order to render them less conspicous, from the air, to possible enemy intruders. The other photo (2nd pic.) shows another airfield (Langar), and is included to show the shape of the loop - type dispersals more clearly. Note how these un-tarred runways really stand out, a great beacon from a distance!
The bare concrete areas at Hethel were a brown shade, due to the sand and spar mix used. and would be slightly darker in colour to that used in my Boston diorama, more of a 'Light Earth' colour. The approach tracks would normally be around 50 feet wide, as were the 'loop', and the circular pan of the 'frying pan' dispersals would be around 100 feet in diameter. If you need exact dimensions, I'll see if I can find them for this field. In 1/48th scale, if you model a 'loop' dispersal, each arm of the loop will be 15 to 16 inches wide and 30 inches long approximately........hope you've got a big shelf !!
Hope this helps a bit.