See the BOM file for a fairly comprehensive list of parts and sources. I recommend all plastic parts be printed in ABS (as solidly and densely as reasonably acheivable) in order to keep their strength while coming in contact (or near contact) with other very warm (read: hot) parts. I found 5 perimeters and 35% infill to very VERY rigid.
I'm using CF effector rods and magnetic ball joints. The idea was to use a 1/2" ball end mill on the alloy shoulder screws to create a spherical socket. These shoulder screws get epoxied into the CF rubing. The PTFE tape would then be placed in this socket for the magnetic sphere to ride on. The plastic parts where the magnets mount to have cavities on the opposite side to give a good area for some JB weld to help hold those magnets in place. The magnetic spheres should be roughed up some ONLY where the epoxy is going to touch them, in order to provide a really good adherent surface.
Each diagonal carbon tube is 360mm in length - this is JUST the carbon tube measurement, not length overall with the bolts in both ends. Obviously, the shoulder screws will add length.
The effector is designed for use with a J-head (V5). Too many effector designs mount the hotend right on the bottom, sacrificing a decent amount of Z travel. This design GIVES you all of that lost spacing. I have printed the effector plate with minimum support and it came out PERFECT. Also, this design allows for a fan to be permanently blowing across the thermal pinch area and keep the cold side of the hotend cool. The ducting continues PAST the hotend, so this ensures more turbulence in this region, cooling it down better than most other designs I've seen. Metal tape can be used to 'seal' off the hotend after it is installed. This will prevent any of this air reaching your extruded filament (great when printing ABS or some nylons) as well as insulating everything above the hot part of the hotend. I've tested this with a cheapo 12V 20mm fan and it moves quite a bit of air. You would be hard-pressed to find a better design.
I'm still working on a separate piece that will mount to the effector plate to mount another fan that can be toggled to directly cool your extruded plastic (PLA).
The carriage effector part is designed such that you can use open-loop belt. The ends will wrap around the posts and the teeth from the belt will engage its own self, locking it in place.
I was planning on using the Airtripper Bowden extruder (BSP edition). You can find this thing on Thingiverse.
The J-head sort of friction-fits into the groove on the effector. Also, the J-Head cap bolts on top of that to really hold that thing in place. The cap also allows you to use a standard groove-mount j-head and adapt it to a bowden configuration by screwing in a BSP fitting into the cap.
The flange bearings are to be installed in sets of 2 with the inner races facing each other. Then, the long M6 bolts will bolt through the top corner piece, through the flange bearings, and into a t-nut riding in the aluminum extrusion. This provides a VERY robust mounting system.
I'm still working on the best positioning for the endstops.