Look in for a 29+ Boost Hardtail frame for a friend. I have yet to find one please let me know if you know of one. Needs to fit 3.0 tires at min.
If you want to put fat tires, the frame that looks like a Stache do it.
I did order one for a friend, a few years ago from Peter, but he's does not seem to respond anymore.
Here is an example I quickly found http://www.flyxii.com/PRODUCTSDetial?product_id=30 (http://www.flyxii.com/PRODUCTSDetial?product_id=30)
Thanks for the link Carbonazza, I was looking for a frame of that style. just put my order in.