Has anyone ever made a turbo fit under the stock hood?[/QUOTE]
There have been ingenious placement of turbos seen on this forum. Do a search for the turbocharged vehicles and enjoy the pictures.
Bottom line: it would come down to the matter of "fit under the stock hood" of what? The existing vehicle options might play a part in available space (air conditioning?). Also, which (brand, size) turbo(s). Two smaller units might be easier to package than one large turbo -OR NOT.
For the sake of "full disclosure" I must admit to being a boost junkie - therefore any way possible to mount a turbo should be explored.