How to create a Giant Snail for Dungeon Crawl Classics part 2

Part 1 was explaining the problem; that is, there is no published giant snails for DCC RPG.  What the hell is that about? Giant Snails should be a creature in every Monster Manual or Bestiary ever made, but no... no love for giant snails. Anyway, I'm going to make one for you, right here, right now! First, I'll take from what I have already. Flail Snail (ADnD) AC:4, -8 to hit body