Gears on a singlespeed frame I'm building a new bike and have ridden a frame which feels (and looks) amazing. I'm dead set on buying it but it's a single speed frame. Ideally I would like gears at the rear. It has a dropout which can house a derailleur but there are no cable stops on the frame. It has been suggested a just run the cable straight into the derailleur and should work. 

Has anyone ever tried/seen this setup?

EDIT:

In response to some of the comments, this is the frame in question;



It's a great ride and I'm really struggling to find anything that rides anywhere close it, hence my attempt at finding a solution. It may turn out that I do need to choose another frame, but I wanted to explore all options before going back to the drawing board.
It could work, but you'll end up with unsightly cable ties or something to hold the housing to the frame.  Plus the shifting performance won't be great given all the slop that can accrue in a long unsupported housing.

If you're fixed on this frame, how about getting an opinion from a local bike shop or frame builder, as to whether they can braze on some... "braze-ons"   That was how the extras were fastened on in the early days.  Of course all this comes at a direct cost to your wallet.

Price this against an internally-geared hub like the nexus and make a decision based on price.

Or learn to ride a single speed and save.