Peter Verdone has published a nice post on his custom Engin Cycles 27.5″ hardtail. Peter came up with the geometry that he wanted and Drew (owner/builder of Engin) came up with the specific construction details and made it a reality. Peter actually designed the dropouts on the bike which have been seen on a few of Engin’s other bikes (here, here). They are very trick looking. You can check out lots of detail photos on Peter’s site.