Staring at a screen of full of the tops of Lego pegs for hours... where 4 pegs fills an HD image and every spec of dirt looks like a boulder.. the slightest mis-tuning will drive you absolutely mad.

First I had to re-align the camera as the image sensor inside it was rotated by ~2 degrees.  It was also tilted by about the same.  I think I got that about as good as I can get it, so I glued it down.  In the process I disconnected the sensor from the board a bunch of times while under power.  Thankfully, I didn't destroy it.

I also had a Star Wars flashback as the camera flew down rows of mountainous Lego pegs at high speed...  :)

Now.. I can tell you this.  

My motion platform is reliable, aka... my errors are consistent.

And... it is still not tuned properly.  :)  Over 64mm, I'm off by about 1mm still.

I should be able to pick any 8mm multiple of X or Y now, and see the same image (as the Lego sheet I'm imaging, the pegs are all at 8mm spacing).  They still shift a little.

Eventually, I hope to use this to automatically calibrate everything, but I'm not there yet.

Working on it..