Here is an attempt at a Jade Falcon Faction Pure army for Storyline 2 (Dragon). Opinions please.

Ursa x1
Rank: Star Commander x1
Inferno Flamers x1

Zeus x1
Findlay, Shizuka x1 (recruited to CJF)

Huitzilopochitli x1

Long Tom Artillery

Sniper Team x2
Gnome Battle Armor x1
Gray Death Battle Armor x1

Clan Battle Armor x2
Gnome Battle Armor x1
Gray Death Battle Armor x1

Faction Pride (Allows mechs to move in formations)

is that really 900 points?
Still I would go with a RC10 for the Huey, and change the Ursa to loki or something with a bit more punch

Aye, it is 900. See following point values:

Ursa = 164
Rank: Star Commander = 27
Inferno Flamers = 44
Zeus = 249
Findley, Shizuka = 59 (including recruitment)
Huitzilopochitli = 97
Long Tom Artillery = 70

Sniper Team = 20 x 2 = 40
Gnome Battle Armor = 20
Gray Death Scout Battle Armor = 21

Clan Battle Armor = 19 x 2 = 38
Gnome Battle Armor = 20
Gray Death Scout Battle = 21

Faction Pride = 30

Total = 900

I'd have to figure out what I could remove to add in the R10 and/or Loki

isnt line of fire blocked for arty in scenario II ? (dust storm) and ranges reduced to 8" (even for arty right?)

My understanding is yes it is blocked, so you can never get the +2 to attack for line of sight. However artillery range is a special type of range. Artilleries have min range, max range and artillery range. The dust storm PC lowers the max range to 8" but not the artillery range. At least this is the way the PC card reads in my opinion.

You are correct. Artillery range is not affected by Dust Storm so many artillery (e.g. Long Toms and Paladins) are actually better as a result.

Lots of people are going to be focussing on close combat so the Decoy on the Ursa won't avail you of much. You've sunk a lot of points into two 'Mechs and you have a tank with an 8" range and awful speed that will never get there in support. If you're going to use a tank in this scenario then it needs either to be fast or to be transported.