A strange urge to bodge up more kit for Little Cold Wars, combined with the availability of cheap crappy plastic M-48 Pattons led me to embark on a project to build a Sergeant York Division Air Defence system. The original was a US Army project to replace the M-163 Vulcan SPAA system and involved combining a huge turret mounting a pair of 40mm guns with the hull from a surplus M-48. Astonishingly the grossly overloaded 20 year-old chassis was unable to keep up with the zippy new Abrams and Bradleys it was supposed to protect. More entertainingly the radar proved unable to distinguish between low flying helicopters and clumps of trees - or indeed the muzzles of the gun barrels!
The real M-247 was cancelled in 1985 - I offer my model as a tribute to the US taxpayers who funded this debacle.
The turret was assembled from balsa. I found the radar dish in the spares box and the gun barrels are brass.