Alright I want to build some tables for handling light vehicles under ten tonnes in Spacemaster. In particular I feel that the existing Vehicle Law attack tables are entirely too focused on the capital ship scale stuff.
Obviously AT XI (Steel) is pretty directly equivalent to AT20 (Full Plate).
AT XI (Steel), XII (Titanium), XIII (Crysteel), XIV Cystanium, XV (Reinforced Crystanium), and XVIII (Crystanium Double Hull), would use AT 20 with various defensive bonuses and damage divisors.
AT XVI (Fullerene), XVII (Reinforced Fullerene), XIX (Fullerene Double Hull), and XX (Colossium) would provide AT X.
Possibly some very light vehicles like motor cycles and Go-Carts would only get AT 17 or VIII
So Here's what I'm thinking
AT XI (Steel) AT 20 +10 DB
XII (Titanium) AT 20 + 20 DB
XIII (Crysteel) AT 20 +30 DB
XIV Cystanium) AT 20 +40 DB
XV (Reinforced Crystanium) AT 20 +50 DB
XVIII (Crystanium Double Hull) AT 20 +50 DB & 1/2 Damage
AT XVI (Fullerene) AT X +10 DB
XVII (Reinforced Fullerene) AT X +20 DB
XIX (Fullerene Double Hull) AT X +20 DB & 1/2 Damage
XX (Colossium) AT X +30 DB & 1/2 Damage
Alternately I could map strictly to the Space Master armour types and ignore special rules regarding critical types. This would be cleaner but obviously wouldn't map directly to the descriptions of the armour types.
AT XI (Steel) AT I
XII (Titanium) AT II
XIII (Crysteel) AT III
XIV Cystanium) AT IV
XV (Reinforced Crystanium) AT V
XVIII (Crystanium Double Hull) ATVIII
AT XVI (Fullerene) AT VI
XVII (Reinforced Fullerene) AT VII
XIX (Fullerene Double Hull) AT IX
XX (Colossium) AT X
In this case I'd probably assume that the size of the target pretty much cancels out any DB for being heavier than human scale armour. Besides, Vehicles have 1000 x mass in tonnes human scale hit points.
I'd probably do a blast and pierce critical table for aircraft and ground vehicles since losing altitude isn't a hazard cars normally face.
Any thoughts?