Jags,
I think the only way to make the cables blend in would be to paint them
Having full length outers means no water or grit gets in with the cables.
No easy way of routing the cables inside as the frame tubes are sealed and there are S&S couplers.
Vik,
I bought a Supernova E3 asymmetric (glare free) a year ago to get the then brightest dynamo light. Of course, not long after, Solidlights came out with their upgrade so I got that done and it is worth having. Both lights are very bright.
I use the E3 for most road riding with traffic and the Solidlights if little traffic is expected on route as it puts more light up in front of you.
The Solidlights comes on at a slightly slower speed than the E3, both are driving a rear light and have a standlight facility. The E3 has no effect on my wireless computer. The Solidlights has a flashing mode.
I have no doubt that quite soon one of my sons will work out that with 2 front lights he will be able to borrow one if only he could have a dynohub front wheel for Christmas
Julian.