Wayne,
as this particular piece is heavy artillery, and so big, you'd need a whole gun park just to keep it on display. then if its in-action, with the trails spread, and a gun crew supplimented by a gun tractor, there's another cabinet you'd need.
Lets stick to Field Artillery, there is still so much to be produced, let alone a re make of the trusty old 25 Pounder, that caould be repainted for European and Noth African Theatres. We still don;t have a US 105mm Howitzer, a British 5.5" Medium Gun, and then there are those 'funny' Italian guns.......
John