Hi, I am also starting a ip-256sl build, most parts are ordered and should start arriving soon. The XMI parts are ordered from Bert at xmiplay. The response on emails was fast until the last one after the payment, after the payment i got a email that the payment was received and the frame would be send off in three days that was on 22 september. After that no reaction on emails very strange. 
But I am still confident that it will be okay.

I doubted a lot about the gear/groupset i wanted to use, so many choices 1/2/3x10, 1/2/3x11,  cassette and chainrings. So i decided to start with a old groupset i have the XTR m960 groupset (3x9) and see which gears i really need on a 29er.
The frame will be UD glossy and the rest of the parts 3k glossy.
Buildlist:
https://docs.google.com/spreadsheets/d/1TLrG1Y8_lMO3gOT-Pvp5JmiRRGxrExB_o7yUe6KZ-bE/edit?usp=sharing

I hope to post soon some pictures of the frame and wheels.