TEXT: www.firefly-games.com
  Firefly Games
  Scaling MONSTER ISLAND
  The rules in MONSTER ISLAND: THE GAME OF GIANT MONSTER COMBAT work
  well for games using cardstock figures, metal miniatures, or toy monsters 
  up to about 6” tall. Larger toy monsters and stuffed animals call for some 
  simple scaling rules in order to make the game more enjoyable.
  When playing with larger toys:
  I Double the base Move scores of all kaiju, human military units, and alien
  invaders.
  I Halve all range penalties. For example, an attack at 12” range normally 
  calls for a -2 to hit. In a large-scale game, the penalty would be reduced 
  to -1. Attacks at 0” to 10” range have no penalty.
  I Allow kaiju to throw or shove foes a distance equal to their full Strength
  score in inches, not half as in smaller-scale games.
  I In large-scale games of ESCAPE FROM MONSTER ISLAND, low altitude is 12”
  and high altitude is 24”.
  I In all other cases in which ranges, radii, or other dimensions for 
  various powers or attacks are given, double the listed number of inches.
  For example, the Electromagnetic Pulse power in INVASION OF MONSTER
  ISLAND lists an effective radius of 3” around the alien vessel. In a large-scale
  game, this would be doubled to 6”.
  
SOURCE: textdata/thevault/Collections/Anime & Cartoon RPGs/3) Common Tropes & Themes/Mecha & Kaiju/Monster Island/Action System - Scaling Monster Island.pdf