Get yourself a gallon of degreaser from Sam's or Costco. The one in the black gallon, cost about 3 bucks. Drop the model in a recipient with the degreaser and leave there a couple of days and it will come apart by itself. This process will also strip the paint off. So You get 2 tasks done for the price of 1.
BEWARE, USE GLOVES THIS STUFF IS STRONG!!