We did speak about routing the cables inside the frame but obviously this would involve drilling the frame which would invalidate the warranty. When it's out of warranty then it could be on the cards.
Calfee do a seat post with the battery pack mounted inside but it's mega money and would have ruined the Enve theme! Similar with the stem, and then there's the additional cost again.
As it stood Rob had to splice an additional Di2 loom into the existing one to make it long enough to reach the rear mech - its frightening how few copper strands there are in those cables! So to run it inside the frame would have been a right pain in the arse, especially if things break (remember, there's not many of these about so there's every chance it might have some issues to start with). It's actually pretty neat up close and I've still got the option to run other groupsets/ss should I want to.
As for reasons as to why it's got Ki2 on it - well, just because I suppose. Yes, its more complicated and yes, there's a higher chance of borking, but it's pretty cool (I'll get a video of the front mech self trimming) and I wanted it. So that's what it comes down to really. I'm never going to win an Elite MTB race (hell, I'd settle for a win in Sport!), but there's nothing to stop me having a nice bike to finish mid pack!
I suppose if you were a Pro racing every weekend, chucking your bike on a plane every five minutes, training on it round the clock then the ideal set up would be full XTR/XX so if and when stuff breaks you can easily replace it. Functional rather than form. But I'm not, I don't so that's why its got this.
The bars are a low rise Enve bar - they're bloody light but pretty strong. I've got a set on my other bike (I might be selling them) and its had a season of abuse and they still look mint. Can't praise the Enve stuff enough, worth every penny in my book.
Ki2 stuff - Not sure if you can still buy it as a complete kit from K-Edge. Lifecycles sourced the necessary Di2 stuff in the UK and had it shipped to the US for the conversion. This mainly involves the shifter pods and changing the rear cage to a long one so you can run a bigger cassette. Its all very nicely done, and they remove nearly all the dura ace branding too.