Also, an interesting thing I learnt from this was that this intended
not as an SP but simply a mechanised carrier - ( I thought SP as soon as I saw it) - there were only a few dozen made ending up as supply carriers - some with the cannon dolly deleted.
The idea was to just get the cannon there without all that messy mucking about with horses... then I'm guessing at some stage someone stood back, looked at it and thought - why don't we just leave the arty on board and make the whole thing an artillery piece... I have read that whilst this was possible in theory it was never recorded as ever happening.
I'm tempted to enter "whatif" territory and create another British WW1 landship specifically as a front-line support SP arty with light support weaponry..
I did do a master for Eureka Minatures many years ago for his Victorian Era steampunk wargame "Pax Limpopo" - a 28mm scale British Pangolin class landship ( HMS Chelmsford in this case)
..and those aren't WH40K or spacey figs - they're Pith-helmeted Poms in steam-powered armoured suits