The power distribution is it the photo attached, it is a small PCB that bolts into the bottom of the frame, no modification needed. I did buy this extra but it was only $1. Much easier than making a power distribution plate yourself.
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The Tarot 680 Fly's very well, it is stable and really stay put where ever I want it. The down side is the legs, these broke on one hard landing (read crash). Instead of ordering new replacement parts I just ordered CF tubbing and cut this to length for the vertical leg stands and also for the horizontal landing skids. This is held to gather by a simple pipe T Joint which works well. Also in doing this I was able to increase the distance of the ground clearance to provide enough space for the Photohigher Gimbal.
Some people are complaining about the strength of the plastic clips than hold the arms in place when you fold / unfold. I bought extra clips incase these fail but so far not one clip has broken.
"I did buy a PCB for it for power distribution..."
Do you mean a power distribution board or do they have a PCB layer like the F550's have where it's built into the frame? Is that an upgrade? How do you like the Tarot 680? How does it fly? I'd like to move up to that from the F550. Can you upload a few pictures of yours and how it's setup? Thanks!!!