Architecture is the TYPE of body built — two door sedan, four door sedan, station wagon, minivan, convertible, etc.
Architecture does not refer to specific parts sharing, but the second grouping of two letters in the body code (not used in the VIN) specifies specific trim levels, which are groups of parts.
A platform only define the space required to assemble the parts and nothing more.
A chassis is only the structural parts that attach the suspension, brakes, powertrain, steering, fuel, and ride control systems to the body.
— Bob Sheaves
Original is at Automotive platforms - definition
http://www.allpar.com/ed/platforms.html#ixzz2YKaqVai6
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