Thanks for posting these photos, Ed.
The left sponson box looks to be an armoured bin for the 19-Set. B-Set aerial base set in forward outer corner, with perhaps a strap iron brush guard aft of it for the A-Set aerial. That is quite an interesting mount and base combination for the A-Set aerial as well.
Take a look at the cover over the 'Engine Compartment', immediately forward of the screened section of top hull. It looks to be divided into two sections across the vehicle, at the mid point. It also does not look all that flat in either photo. Could this cover be canvas or wood, perhaps? Showing a little waviness with age? Could it fold open from either end? Would the small circular opening at the back be for checking radiator fluid/oil?
Also very intriguing, as I know very little about these machines. (A) What is the nature of the small cylindrical tank running along the upper left rear side of the screened section? (B) there is a very large vertical, curved structure at the right rear corner of the vehicle. Would this be an armoured fuel tank?
Damn!!! I WANT ONE!!!
Thanks again, Ed.