Just Mecha grade armor, Orion. Armor doesn't have any rating, though the relative toughness of a unit would be reflected through its structural rating. For example, if Wes decides that the mecha category can take five times the weapon their size rating to take down, it'd look like this.
Legend
Lethality modifier: how easy it is to destroy something in SARP.
Effective Size: On a scale from 1 to 5, how significant is the unit in regard to others of its category.
Lethality modifier = 5
Effective size = 5 (tank, shuttlecraft)
Lethality modifer x Effective size = Tasha's structural points
So, the Tasha would have 25 structural points. Assuming it has no energy shielding on that in addition, that means it'd easily be able to cope with 9 attacks from a Mindy II's forearm weapons (90 seconds of continuous firing on it, regardless of firing mode), without charging them.
By contrast, the Mindy power armor would have 10 structural points (assuming size 2).
Hypothetically, that is. It's not like it's been approved yet and the structural point idea was an addendum of mine.
Note that the Tasha will be dodging and shooting back. The Mindy II might never be able to make those 9 attacks, though it does have more than 1 weapon system.