I needed to trim about 1/8" off the top of the coin slots, to avoid having the top of the part bump into the rib above it. I did this using the Dremel with the cutoff wheel.
Next, I cut a couple of 3.5" segments of bar, that I hammered into an 'S' shape to help hold the coin returns in place.
I marked and drilled a hole for a 3/4" long #4 wood screw that will secure the bar in place.
For droid #1 I have one of these bars, I decided to go with a pair of them for droid #2. The
Next up, the front power coupler. As with droid #1, I stayed with the metal bars again. I cut a couple of segments, roughly 1.25" to 1.50" long, and marked and drilled the holes for a 3/4" #4 wood screw, just like for the coin slots.
With the two bars screwed down, the power coupler is secure.
I might work on installing the octagon ports next, but I need to decide exactly how I'll deal with the aluminum version I'm using on droid #2. I'll likely do something similar to what I did for droid #1, and drill a couple of holes for screws in the back and attach some sort of paddle to the back of the octagon port and to the rib above it. We shall see.