PCGen adding the Mammoth Rider coding questions

[Potato disciple]

Hi there folks,
I'm currently looking to eventualy make the entire Paths of Prestige as a source for PCGen. I'm starting with the mammoth rider (no particular reason) and since I don't have a large coding experience, I have a few coding questions:
1) How do I make the Gigantic Steed ability make the animal huge? Is it just "SIZE:H"?
2) How do I affect the animal companion?

This:

BONUS:ANYPC|WEAPONPROF=TYPE.Martial|DAMAGESIZE|1|TYPE=Size

is how you make a pc have large-sized martial weapon damage, no idea how to make it apply to animal companions and natural weapons.
3) How do I make "only really big animal companion[there's a list]" a preq?
Thank you all very much. I am flagging this in case it's the wrong forum, though.

PD

[Nylanfs]

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[Potato disciple]

Oh thank you!