Well, we've all heard the saying "One Step Forward, Two Steps Backwards".  I'll come back to that in a bit...

Final Drive "Done":

Cut the chains to length and installed them.  Had to run some errands this afternoon anyway, so picked up some longer M6 hardware at the HW store plus a bunch of nylock style lock nuts for the 1/4 and 3/8 motor brackets.  This way they won't (hopefully) vibrate loose during operation.

Here it is installed and tensioned:

The board is just sitting there, it isn't holding anything up.  It is a test piece for the eventual battery tray, though I might add some supports for the motor end so all the weight isn't cantilevered so far.  Those motors are quite heavy.

Back to the lesson of the day from the opening statement - a keen observer may notice a notch in the aluminum angle that wasn't there previously.  It was an attempt to create a little chain clearance by cheating.  I didn't check the clearance after I moved the motor orientation and the chain hit the frame in the extreme adjustment position.  I didn't want to remake the motor plate, so the notch was born.  It mostly solved the problem, but it still bugged me - so I remade the motor plates 1 inch longer.

This photo shows the final corrected plate with the old one on top for comparison.

The remake also allowed for the addition of a little extra material around the mounting holes at the intersection of the vertical plate, to prevent breaking out the holes under the torque of bending the top plate under load.