To answer the question of Syberian units teamed up with the mobile structures, I have these.
Metro-Central = Metroplex
Metro-Battery (Battery class) = Six-Gun
Metro-Scamp (Beetle class) = Scamper
Metro-Slammer (Brawler class) = Slammer
Tri-Central Command = Trypticon
Tilt-Hounder (Hounder class) = Full-Tilt
Streak Wiper (Streaker class) = Wipe-Out
Blunter (Tanker class) = Brunt
Titanianapolis = Metrotitan
Titano-Ray (Battery class) = Metroshot
Titano-Tender (Beetle class) = Metrodash
Titano-Brawler (Brawler class) = Metrotank
In play, I would have each team of these units Team-Bonded to each other, like all combiner-themed teams.
As to Headmasters/Targetmasters/Powermasters, we discussed these before, I think. On Syberia, most of these would end up being two-unit Team-Bonds, with the smaller unit being a MiniMech/AutoSuit and the larger one a standard-sized AutoMech. For the bigger ones--such as the Fortress-class and other Superheavy AutoMechs--I'd upgrade the small partner to a normal-sized AutoMech in the light or medium weight classes. AutoMechs bigger than the superheavy size class with X-master partners would use AutoMechs of any size as their Team-bound partner.
That's me, though.
- Herb