Referring to my notes for the LAM PV, it's:
Movement: calculate move cost as normal. For example, a Phoenix Hawk LAM (10”j/30”g) would use its highest move rate to calculate its move cost – in this case, its 30” AirMech move rate – so 30/8 = 3.75, and then adding 0.5 points for jump capability (total move cost: 4.25 points). Then add the normal Thrust charge per p. 144 (with errata).
For the Pwwka, we'd have:
Move 36/6a
36/8 = 4.5
Jump Capability = 0.5
Aero Thrust = 1.5
DIR is 11, as calculated earlier, and we have an Agility bonus of 3 right now.
Based on my notes, it's supposed to have the defense bonus from being a WiGE (another +1). Its own attack penalty should only affect its guns, not its defense: I tried to avoid counterintuitive hodgepodges like that. At the same time, both the defense and attack penalties are based on specific modes. It's being charged under the assumption that it's always flying around, but getting no offense discount for such.
I'm not sure how to account for the attack penalty. It appears as if it was ignored.
The matter of defense depends on what changes ASCE introduced: as Thunder asked, what's its TMM supposed to be in Airmech mode?