There are several variants of this type of thing floating around already, this is where I am going to store my take on them. Starting with the Y bed and frame cable chain mount. I went with a 10 x 15mm chain for everything. Here is the Thingiverse project for the Y axis piece so far. next up will be the Z and X mounts, which will be specific to the Openrails mods. The Y axis will fit a stock printer though just fine.
Y axis Cable chain mounts: http://www.thingiverse.com/thing:1145951
Y_bed_chain anchor_Bed_Latch_1_0_a .stl (70.5 KB)
Y_bed_chain anchor_bed_base_1_0_a.stl (143 KB)
Y_bed_chain anchor_Frame_1_0_a.stl (90.7 KB)