Er, Narric? Brainfart alert I'm afraid - you've got this line:
- The model/unit must be a large Creature or Construct capable of Flight.
in Skymasters
and Landterrors...
Also, re the Heavy Infantry category, I'd be a bit hesitant about specifying a base size. Yes, I know we're ultimately a 40k site, but that leans rather explicitly to Terminators, Battlesuits, Wraiths etc for my taste. I'm just thinking of people wanting to enter, say, an Imperial Greatsword unit, Black Orcs or even (=I= WARNING HERESY AHEAD =I=

) non-GW minis/game concepts.
I sympathise here as it's actually quite hard to define heavy infantry without reference to explicit game terminology ("I know it when I see it!" lacks a certain... rigour

) - after all, from a certain point of view the whole Space Marine army list (bar scouts) consists of it. Purely my personal view - feel free to kick it out or ignore!