Managed to snap a bit of time to do a bit more. Can't wait to have a weekend to actually spend a fair bit of time on this (not for a few weekends though).
Anyways, the bow just needs a bit more detail adding and then joining up. Here's a quick grab to show the bend it has (not tightened up to play with).
Also I've started adding detail to the head (smoothed version showing) and started on the basic shape of the body.

https://www.flash-fx.net/3D/images/cello/bow3a.jpg

https://www.flash-fx.net/3D/images/cello/head2a.jpg

https://www.flash-fx.net/3D/images/cello/head2b.jpg
https://www.flash-fx.net/3D/images/cello/body1a.jpg