The C1000's could work pretty cool for this. I have done this basic thing, though on a bit larger of a scale. Used one C1000 for a close mic on the guitar, as well as an SM 57. Also included an MXL Vocal mic, then I used another C1000 for a room mic. I am not sure exactly how bright your bathroom is, so it may be a little more harsh thatn you want. Not knocking the idea, I tihnk that is the best way to record, live with natural reverb, but another room may serve you better.