Well all my parts showed up!
The DFRobot platform was better than I expected. I thought it was going to be plastic, but it was a well-machined piece of metal.
They included a 5-cell AA holder, which was nice. Wired that to the included power switch for running the motors.
The holes where you mount the Arduino board (on top plate, I assume), don't quite line up. I could only get three posts to line up, and then I could only actually screw in two of them.
Not that much room left for my breadboard, unless I cover the servo hole. Which I don't want to.
Need to figure out a way / a thing to mount my ultrasound rangefinder on to.
Now I am working on the fun part, programming!
I took pictures along the way to document. Actually, I forgot to take a few pictures I was so excited. So I un-assembled, took pictures, and re-assembled the robot.
But the coolest part of this project so far is getting my young son and daughter involved. Daughter is way young, just wants to "see the robot go", but my son helped put many of the parts together.