Ricoh kind of attempted this (albeit mirrorless, not SLR) with the GXR series: http://www.ricoh.com/r_dc/gxr/features.html http://www.ricoh.com/r_dc/gxr/feature

Ricoh kind of attempted this (albeit mirrorless, not SLR) with the GXR series: http://www.ricoh.com/r_dc/gxr/features.html http://www.ricoh.com/r_dc/gxr/features.html If I understand correctly, the body has the grip, LCD, and processor, and you can swap out individual APS-C/lens combo cartridges.