It's finally ready to put everything together.  I added a heatsink to the Pi as it was getting unacceptably warm under load.

The motion platform, power, and wiring for my prototype cape for the BBG with vacuum sensing and the required power mostfets (under the board) is done.  Perhaps that can be the board this builds..  :)

Now I can flip it over and assemble the top.

Labor day.  The day you get to labor, on the things you love to do.

EDIT: Day went pretty well.  

• Machinekit is mostly plumbed up and homing.  I'm finally using the pythonic configs, so that was harder than it sounds.  I converted from having 3 endstop channels, to having one wired closed circuit instead.  Simpler, and same effect, but had to go dig in the source code of Machinekit to figure out how to make that happen.  :P
• I found an error in my math for generating the baseline I use for calibration!  My Z deviation is much better now and I know why, which is more important.  It's still not dialed in yet, but it's now within a couple mm of the calculated value, instead of *cough* 50mm *cough*.
• Most of the wiring harness above the bed is done, but other than the endstops, not plugged in.  I'm not installing the PNP head until I know I'm not going to slam it into the bed.
• Lines got cut, measured, and installed.  Of course I forgot to include my endstop beads, and now I can't find them.

I'm headed to town to get some beads.  An hour trip for 3 beads, but I just can't accurately calibrate this thing until I have them, and my home positions on each string cease to move around.  I'm going to drill and tap them to add set screws this time so I can lock them in place.  They moved around a bit when the prototype got packed/unpacked, and I can't have that happening.   

X axis is backwards too, so I need to swap two of the joint axis somewhere..

EDIT 2:  Of course I then accidentally bought glass beads instead..  So then I spent about 2 hours machining some out of AL, didn't like how they turned out, and then quit having accomplished absolutely nothing.