I found an original message from mtbr: http://forums.mtbr.com/29er-bikes/chinese-carbon-29er-640919-post10128235.html#post10128235, it was years ago.

Will get new CS-057 frame soon, will try to route the cable to seatpost area.

Quote from: Sitar_Ned on August 11, 2015, 09:51:46 PM
I've read that it will ride just fine with a 120mm fork.

Here's a pic of an 057 outfitted with 120mm fox, dropper post, and flats:

How is the seatpost cable routed?

Quote from: Vipassana on July 22, 2014, 01:13:46 AM
I've been delinquent in updating this thread.  Parts have started to arrive from iplay and elsewhere.  We have received one frame IP-256 frame, and many of the smaller carbon parts like bars and posts.  The wheels were shipped last week and should arrive late this week or early next.  The two frames getting paint will ship this week. 

IP-SP7 Seat Post - 180g:

By the way, is this weight for 350mm seatpost or 400mm?