Here's a couple of photos of the real thing, at the Duxford air museum:
There are a couple of minor inaccuracies and omissions in my model which I discovered
from looking at the real vehicle, for example my model does not have the welding seams
on the hull side, the window shield supports are the wrong shape (the real vehicle has
a ratchet system, my model just has plain rods), and the two small circular objects either
side of the radiator are actually small lights, not rivet heads as I had thought from my reference drawings.
They are a flattened spherical shape and have an electric cable attached. The main headlight
also has a cable, as you can see from the pics.
Still, I think my model is fairly good, many commercial models have at least as many "problems" :)
Another interesting small detail is that the vehicle actually has the "Standard" manufacturer's badge
above the radiator grille! I might try to paint this on.
Regarding armament, the one in the museum has a Bren gun, whilst my model has a Vickers gun (originally
from a WW1 aircraft kit). Both of these MG types were used, probably depending on what was available at
the time. Some Beaverettes carried a Boyes anti-tank rifle instead.
BTW if this version (Mk.III) looks flimsy, the earlier ones were even worse - the Mk.II was open-topped and
the Mk.I even had an open back, protected only by wooden planks(!). But the Mk.III was the most common type.
Not sure how many of these vehicles are still in existence.. there is one at the Cobbaton military vehicle
museum in Devon (which was my inspiration for building this model) and there is probably one at Bovingdon,
but I don't know of any others.