[SierraGS]

I took the approach to minimize overlap but have at least two models from every architecture to maximize customer selection and profits while keeping the overall number of platforms down.

Chevrolet
Kei 5D (Matiz) - Gamma
Aveo 4D - Gamma
Beat/Agila 5D - Gamma
Cobalt Coupe - DeltaII
Cruze 4D - Delta II
Optra Wagon - Delta II
VOLT - Delta IIE
Monza Wagon (Kappa Nomad Concept) - Alpha
Monte Carlo - Epsilon SWB
Malibu 4D - Epsilon LWB
Camaro - Zeta
Impala - Zeta
Impala Estate - Zeta
Corvette - Kappa7
Trucks
Groove - Gamma
Vue/Meriva - Gamma
Orlando - DeltaII
HHR - DeltaII
Zafira Van - DeltaII
Equinox - ThetaE
Colorado - GMT700
T-Blazer - GMT700
Astro/Vivano - Alpha
Traverse - Lambda
Tahoe - GMT900
Suburban - GMT900
Avalanche - GMT900
Silverado - GMT900
Cheyenne - GMT900HD
Express Van - GMT900HD


Buick (B-P-G)
Skylark 4D - DeltaII
Insignia Avant - Epsilon SWB
LaCrosse - Epsilon LWB
Gran Sport - Sigma
Electra - Zeta LWB
SUV's
Rendezvous 7P - ThetaE
Enclave - Lambda

Pontiac (B-P-G)
G3/Corsa 3D & 5D - Gamma
G5/Barina Coupe - Gamma
G6/Calibra Coupe - DeltaII
G6/Twin Top HTC - DeltaII
Vibe (as is)
Solstice Roadster - Kappa7
Firebird Coupe - Alpha
GTO/Monaro - Alpha
Grand Prix 4D/Torana - Alpha
Truck
G8 ST - Zeta

GMC (B-P-G) - GMC becomes GM's Global Truck/SUV brand and is offered with Cadillac/Chevrolet/Daewoo/Holden/Opel/Vauxhall brands outside U.S.
Trax - Gamma
Combo - Gamma
Montana - Gamma
Terrain - DeltaII
Jimmy H4 2D - GMT700
Jimmy H3 4D - GMT700
X-Treme - Alpha
Envoy 5P - Alpha
Acadia - Zeta
Denali - Zeta
Savana Van - Zeta
Safari H2 - GMT900
Yukon/XL Denali - GMT900
Sierra/Denali - GMT900
Kodiak - GMT900HD

Cadillac
BTS 4D - Alpha
CTS Coupe/4D/Wgn - Sigma
SLS - Zeta LWB
XLR - Kappa7
SUV/Truck
SRX - Alpha
Evoq - Lambda
Escalade - Zeta
Escalade EXT - GMT900


If SAAB and Saturn survive

SAAB
9-1 Sonett - Gamma
9-3 3D/5D/Combi - DeltaII
9-5 Convert/4D/5D - Epsilon
9-4X - ThetaE

Saturn
Sky/Tigra - Gamma
Aura 4D - Gamma
Vue - Gamma (Chevy would offer Meriva)

This lineup minimizes duplication and "fits" brands with global counterparts and by moving HUMMER models to GMC and making GMC the global truck/SUV brand GM only has to make one "Global" model that can be sold with any other GM brand in any other market except the U.S. and Canada where they would remain with B-P-G. GMC will remain GM's best cash provider as long as it remains with the B-P-G channel and wll increase profits delivered when the Buick and Pontiac lineups improve.

The "Kappa7" would be the next gen Vette and be used for the next Solstice (and Opel GT) since the Vette is setup as a Convertible, but the Solstice would not offer V8 engines.