The problem isn't that it's impossible - the article demonstrates otherwise - but that it's very difficult to pull off aesthetically well. Consider that what yo

The problem isn't that it's impossible - the article demonstrates otherwise - but that it's very difficult to pull off aesthetically well. Consider that what you'd want to add, to be comparable to a conventional DSLR, would be the sensor, LCD, image processor, additional controls, card cage(s), battery - it'd all take up extra space, and all on the back of the body, rather than integrated into the overall space of the body. So, a fairly substantial engineering task, and that's only for a back which would be designed for either a specific model of body, or a small number of identically sized bodies. Then consider the numbers you'd be likely to sell, versus competing with the units rolling out of Nikon, Canon, et al. Which is not to deny the geeky appeal of doing it anyway. =:)