there is a Accurate Armour Super Pershing and they did a normal Pershing, now they do conversions for Tamiyas Pershing like the M45 Howitzer and the M26a1
they also do a M46 Patton tank
heres the link http://www.accurate-armour.com/index.cfm?CFID=548838&CFTOKEN=49236587
im not sure Cromwell models ever made a Pershing, but they might have