I thought the GS-T and the GSX was the same frame? so in theory you would just buy the GSX crap and bolt on.

this is what I thought was the deal with the Eclipses:
Mitsu
RS-GS same frame meaning different engine placement and no provision for the rear end
Toyota
ST-GT-GTS same thing as above

Mitsu
GS-T - GSX same body, different frame than the RS-GS both have the engine placed different than the RS-GS one (GS-T) is FWD Turbo and the other (GSX) is AWD Turbo both have same engine
Toyota
ST is the same as GT but with a Different engine and engine cradle
GT is same as GTS but its the "narrow body"
GTS "wide body" celica
all are FWD
ALL-TRAC Same "wide body" as GTS but with a totaly different frame and engine



cliff notes:
GS-T can be converted to a GSX but a GS cannot be converted to a GS-T or GSX Just like a GTS cannot be converted into an All-Trac.



all AWD cars mentioned above where AWD from the factory, converting an Integra wich has no Factory RWD brother is going to take alot of money/Time and most important Fab skills.