melodious said:
Rollodo, the EM3EV bag has at least 2 slits for the wires to exit/enter. One is in the front of the triange, near the headtube. Another is located to the top rear of the bag, closer to the bike seat. I'm not entirely sure if there is one near the bottom rear of the bag, near the bottom bracket, I'll check today and post an edit...
As far as the picture of you folding montague bike & EM3EV bag. I was thinking maybe modifying a quick release clamp rear seatpost rack. Remove the wide rack, and weld on an angled aluminum bar for the bags bottom velcro can attach to something so the bag stays more in place.
The only closest reliable bag for the PP frame I found is sold by HPC (http://endless-sphere.com/forums/viewtopic.php?f=31&t=53232), is ridiculously priced at ~$140 after the shipping, but I, once again, believe it's the only reliable solution. Though the pricing definitely sucks, I'm considering getting that bag from them simply because I haven't found anything like it anywhere else.
Dimension wise, it appears to be able to hold Paul's 50V 28Ah battery, which is what I consider getting. Coupled with a BBS02, I think it would make a good commuting solution.